/* ==========================================================================
   Tejas Kathuria — Portfolio (gyanl.com Accurate Geometry & Scroll Engine)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Caveat:wght@600;700&family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&display=swap');

:root {
    color-scheme: light;

    /* Typography */
    --font-body: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Monaco, Consolas, monospace;
    --font-hand: "Caveat", cursive, sans-serif;

    /* Light Theme Palette (gyanl.com signature) */
    --bg: #ffffff;
    --bg-alt: #f6f6f8;
    --surface: #ffffff;
    --ink: #111113;
    --ink-muted: #666672;
    --ink-subtle: #8e8e99;
    --line: #e6e6ec;
    --line-subtle: #f0f0f4;

    /* Background Light Grid */
    --grid-line: rgba(17, 17, 19, 0.09);
    --grid-size: clamp(40px, 5.5vw, 56px);

    /* Chat Bubble Tokens (iMessage aesthetic) */
    --chat-bubble-bg: #f0f0f3;
    --chat-bubble-fg: #111113;
    --chat-bubble-radius: 18px;

    /* Hero Geometry Tokens (anchored to viewport centre) */
    --hero-ink: var(--ink);
    --mark-unit: clamp(5px, 1.4vmin, 8.5px);
    --ring-x: clamp(180px, 30vw, 430px);
    --ring-y: clamp(110px, 24vh, 230px);

    /* Shadows */
    --shadow-sticker: 0 10px 24px -4px rgba(0, 0, 0, 0.12), 0 4px 8px -2px rgba(0, 0, 0, 0.05);
    --shadow-lift: 0 18px 36px -6px rgba(0, 0, 0, 0.22), 0 6px 14px -3px rgba(0, 0, 0, 0.12);
    --shadow-card: 0 4px 20px -4px rgba(0, 0, 0, 0.05);

    /* GitHub Activity */
    --contrib-0: #e8e8ed;
    --contrib-1: #cce4d2;
    --contrib-2: #8ec999;
    --contrib-3: #48a858;
    --contrib-4: #237b34;

    /* Transitions */
    --transition-fast: 0.16s ease-out;
    --transition-normal: 0.28s cubic-bezier(0.22, 1, 0.36, 1);
    --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="dark"], .dark {
    color-scheme: dark;

    /* Dark Theme Palette */
    --bg: #0b0b0e;
    --bg-alt: #131317;
    --surface: #17171c;
    --ink: #f5f5f8;
    --ink-muted: #9e9ea8;
    --ink-subtle: #6c6c77;
    --line: #24242c;
    --line-subtle: #1a1a20;

    /* Background Light Grid (Dark Mode) */
    --grid-line: rgba(245, 245, 248, 0.08);

    --chat-bubble-bg: #202027;
    --chat-bubble-fg: #f5f5f8;

    --shadow-sticker: 0 14px 34px -4px rgba(0, 0, 0, 0.7), 0 6px 12px -2px rgba(0, 0, 0, 0.45);
    --shadow-lift: 0 26px 48px -6px rgba(0, 0, 0, 0.85), 0 10px 22px -3px rgba(0, 0, 0, 0.6);
    --shadow-card: 0 6px 24px -4px rgba(0, 0, 0, 0.5);

    --contrib-0: #202027;
    --contrib-1: #1e3a24;
    --contrib-2: #2d5a36;
    --contrib-3: #43854f;
    --contrib-4: #62b571;
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--bg);
    background-image: 
        linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
        linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
    background-size: var(--grid-size) var(--grid-size);
    background-position: center top;
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

::selection {
    background-color: var(--ink);
    color: var(--bg);
}

:focus-visible {
    outline: 2px dashed #0a84ff;
    outline-offset: 3px;
    border-radius: 4px;
}

/* ==========================================================================
   Top Header Navigation (gyanl.com style)
   ========================================================================== */

.top-nav {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: clamp(1.25rem, 4vh, 2rem) clamp(1.5rem, 5vw, 3rem);
    max-width: 72rem;
    margin-inline: auto;
    pointer-events: auto;
}

.brand-link {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--ink);
    text-decoration: none;
    letter-spacing: -0.02em;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.brand-spark {
    color: #0a84ff;
}

.theme-toggle-button {
    width: 2.15rem;
    height: 2.15rem;
    border-radius: 9999px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--ink-muted);
    display: grid;
    place-items: center;
    cursor: pointer;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
    transition: all var(--transition-fast);
}

.theme-toggle-button:hover {
    color: var(--ink);
    border-color: var(--ink-subtle);
    background: var(--bg-alt);
    transform: scale(1.06);
}

.theme-toggle-button .sun-svg,
.theme-toggle-button .moon-svg {
    display: grid;
    place-items: center;
}

.theme-toggle-button .moon-svg {
    display: none;
}

[data-theme="dark"] .theme-toggle-button .sun-svg {
    display: none;
}

[data-theme="dark"] .theme-toggle-button .moon-svg {
    display: grid;
}

/* ==========================================================================
   Hero Full-Bleed Runway & Monogram "T" (gyanl.com authentic engine)
   ========================================================================== */

.hero-spacer {
    position: relative;
    width: 100%;
    height: 180vh; /* Smooth runway for drawing monogram */
    margin-bottom: -40vh;
    overflow-x: clip;
    pointer-events: none;
}

/* Sticky Mark: Monogram "T" centered at 50vh, 50% */
.hero-mark {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    height: 100svh;
    z-index: 20;
    pointer-events: none;
    overflow: visible;
    color: var(--hero-ink);
}

.hero-mark__plate {
    position: absolute;
    top: 50vh;
    left: 50%;
    width: calc(34 * var(--mark-unit));
    height: calc(34 * var(--mark-unit));
    transform: translate(-50%, -50%) scale(var(--mark-shrink, 1));
    will-change: transform, opacity;
    border-radius: 50%;
    background: var(--surface);
    border: calc(1.5px / var(--mark-shrink, 1)) solid var(--line);
    opacity: var(--plate-settle, 0%);
    box-sizing: border-box;
    box-shadow: var(--shadow-sticker);
}

.hero-mark__photo-wrap {
    position: absolute;
    top: 50vh;
    left: 50%;
    width: calc(34 * var(--mark-unit));
    height: calc(34 * var(--mark-unit));
    transform: translate(-50%, -50%) scale(var(--mark-shrink, 1));
    border-radius: 50%;
    overflow: hidden;
    opacity: var(--plate-settle, 0%);
    pointer-events: none;
    will-change: transform, opacity;
    display: grid;
    place-items: center;
    box-sizing: border-box;
}

.hero-mark__photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    display: block;
}

.hero-mark__art {
    position: absolute;
    top: 50vh;
    left: 50%;
    width: calc(44 * var(--mark-unit));
    height: calc(26.8 * var(--mark-unit));
    transform: translate(-50%, -50%) scale(var(--mark-shrink, 1));
    overflow: visible;
    filter: drop-shadow(0 2px 14px rgba(10, 132, 255, 0.22));
    opacity: calc(1 - var(--plate-settle-val, 0) * 1.3);
    will-change: transform, opacity;
}

/* Smooth vector path rendering */
.hero-mark path {
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* Sticky Avatar Greeting & Thinking Bubble below the monogram */
.hero-greeting {
    position: sticky;
    top: calc(50vh + 3.2rem);
    left: 0;
    width: 100%;
    z-index: 15;
    display: flex;
    flex-direction: column;
    align-items: center;
    pointer-events: none;
    opacity: calc(1 - var(--hero-progress, 0) * 18);
    will-change: opacity, transform;
    transition: opacity var(--transition-fast);
}

.hero-greeting.is-hidden {
    display: none !important;
}

.hero-greeting__photo {
    width: 4.5rem;
    height: 4.5rem;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--surface);
    box-shadow: var(--shadow-sticker);
    margin-bottom: 0.5rem;
}

.hero-thinking {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    background: var(--chat-bubble-bg);
    border: 1px solid var(--line);
    padding: 0.35rem 0.85rem;
    border-radius: 9999px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.thinking-dots {
    display: flex;
    gap: 3px;
    align-items: center;
}

.thinking-dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--ink-muted);
    animation: dot-bounce 1.4s infinite ease-in-out;
}

.thinking-dot:nth-child(2) { animation-delay: 0.2s; }
.thinking-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes dot-bounce {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1.15); opacity: 1; }
}

.thinking-text {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--ink-muted);
}

.thinking-verb {
    color: var(--ink);
    font-weight: 700;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

/* Sticky Radial Stickers Ring anchored to viewport center */
.hero-stickers {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    height: 0;
    z-index: 12;
    pointer-events: none;
}

.hero-stickers.is-spent {
    display: none;
}

.hero-sticker {
    position: absolute;
    top: 50vh; /* Crucial: 50vh anchors to screen vertical center! */
    left: 50%;
    pointer-events: auto;
    cursor: pointer;
    user-select: none;
    transform: translate(
        calc(-50% + var(--dx, 0) * var(--ring-x) * (1 + var(--sticker-burst, 0) * 1.5)),
        calc(-50% + var(--dy, 0) * var(--ring-y) * (1 + var(--sticker-burst, 0) * 1.5))
    ) rotate(var(--tilt, 0deg));
    opacity: calc(1 - var(--sticker-burst, 0) * 1.3);
    will-change: transform, opacity;
}

.hero-sticker__btn {
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    padding: 0;
    outline: none;
}

.hero-sticker__art {
    display: block;
    width: auto;
    height: clamp(88px, 17vmin, 138px);
    max-width: 200px;
    object-fit: contain;
    filter: drop-shadow(var(--shadow-x, 0px) var(--shadow-y, 8px) 16px rgba(0, 0, 0, 0.22));
    transition: transform var(--transition-fast), filter var(--transition-fast);
}

.hero-sticker:hover .hero-sticker__art {
    transform: translateY(-8px) scale(1.08);
    filter: drop-shadow(var(--shadow-x, 0px) calc(var(--shadow-y, 8px) + 6px) 26px rgba(0, 0, 0, 0.32));
}

.hero-sticker:active .hero-sticker__art {
    transform: translateY(-2px) scale(0.98);
}

/* Sticky Note Sticker Card (Compact & Small) */
.hero-sticker--note .hero-sticker__note {
    background: #fff9cb;
    color: #2b2712;
    border: 1px solid rgba(190, 175, 90, 0.4);
    border-radius: 0.45rem;
    padding: 0.5rem 0.75rem;
    box-shadow: 0 8px 18px -4px rgba(0, 0, 0, 0.14);
    max-width: 8.8rem;
    font-size: 0.72rem;
    line-height: 1.35;
    text-align: left;
    transition: transform var(--transition-fast);
}

[data-theme="dark"] .hero-sticker--note .hero-sticker__note {
    background: #282516;
    color: #f5eed3;
    border-color: rgba(210, 190, 100, 0.25);
}

.hero-sticker:hover .hero-sticker__note {
    transform: translateY(-4px) scale(1.04);
}

/* Speech Bubble Tooltip Tip */
.hero-sticker__tip {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(4px) scale(0.92);
    opacity: 0;
    visibility: hidden;
    background: var(--ink);
    color: var(--bg);
    font-family: var(--font-hand);
    font-size: 1.02rem;
    font-weight: 700;
    padding: 0.32rem 0.7rem;
    border-radius: 0.6rem;
    white-space: nowrap;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    pointer-events: none;
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility 0s linear var(--transition-fast);
    z-index: 35;
}

.hero-sticker__tip::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border-width: 5px;
    border-style: solid;
    border-color: var(--ink) transparent transparent transparent;
}

.hero-sticker:hover .hero-sticker__tip,
.hero-sticker:focus-within .hero-sticker__tip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0) scale(1);
}

/* Manual Scroll Indicator (Visual Cue) */
.hero-scroll-cue {
    position: fixed;
    bottom: clamp(1.25rem, 3.6vh, 2.2rem);
    left: 50%;
    transform: translateX(-50%);
    z-index: 45;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
}

.hero-scroll-cue.is-gone {
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(12px);
}

.scroll-cue-wrapper {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.38rem 0.85rem 0.38rem 0.6rem;
    border-radius: 9999px;
    background: var(--surface);
    border: 1px solid var(--line);
    box-shadow: 0 4px 18px -2px rgba(0, 0, 0, 0.18);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--ink-muted);
    font-family: var(--font-mono);
    font-size: 0.76rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    animation: scroll-cue-bob 2.4s infinite ease-in-out;
}

.scroll-mouse-indicator {
    width: 15px;
    height: 22px;
    border: 1.6px solid currentColor;
    border-radius: 8px;
    position: relative;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    padding-top: 3px;
    flex-shrink: 0;
}

.scroll-mouse-wheel {
    width: 2.5px;
    height: 4.5px;
    background: currentColor;
    border-radius: 2px;
    animation: scroll-wheel-slide 2s infinite ease-in-out;
}

.scroll-cue-label {
    line-height: 1;
    white-space: nowrap;
    color: var(--ink);
    font-size: 0.76rem;
}

.scroll-arrow-chevron {
    display: block;
    animation: scroll-chevron-pulse 2s infinite ease-in-out;
    flex-shrink: 0;
    opacity: 0.8;
}

@keyframes scroll-wheel-slide {
    0% {
        opacity: 1;
        transform: translateY(0);
    }
    50% {
        opacity: 0.8;
        transform: translateY(5px);
    }
    100% {
        opacity: 0;
        transform: translateY(10px);
    }
}

@keyframes scroll-chevron-pulse {
    0%, 100% {
        opacity: 0.4;
        transform: translateY(0);
    }
    50% {
        opacity: 1;
        transform: translateY(3px);
    }
}

@keyframes scroll-cue-bob {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(4px); }
}

/* Mobile Media Queries for Hero Ring & Layout (60-120fps GPU acceleration) */
@media (max-width: 640px) {
    :root {
        --ring-x: clamp(120px, 35vw, 155px);
        --ring-y: clamp(90px, 15vh, 125px);
        --mark-unit: clamp(4.6px, 1.3vmin, 5.8px);
    }

    .hero-mark__art {
        filter: none !important; /* Removes dynamic SVG Gaussian blur on mobile GPUs for fluid 60-120fps scrolling */
    }

    .hero-mark,
    .hero-mark__art,
    .hero-mark__plate,
    .hero-mark__photo-wrap,
    .hero-sticker {
        -webkit-transform-style: preserve-3d;
        transform-style: preserve-3d;
        -webkit-backface-visibility: hidden;
        backface-visibility: hidden;
    }

    .header-bar {
        padding: 1.1rem 1.15rem 0.5rem;
    }

    .hero-sticker__art {
        height: clamp(48px, 13vw, 68px);
        max-width: 82px;
    }

    .hero-sticker--note {
        display: none; /* Hide wide sticky note on small mobile screens to keep view clean */
    }

    .content-container {
        padding-inline: 1.15rem;
        padding-bottom: 4.5rem;
    }

    .chat__card {
        padding: 1.1rem 1.15rem;
        font-size: 0.92rem;
        line-height: 1.62;
        gap: 0.75rem;
    }

    .resume__list {
        gap: 0.65rem;
    }

    .resume__row {
        padding: 0.85rem 1rem;
        gap: 0.85rem;
        border-radius: 1.15rem;
    }

    .resume__plate {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.2rem;
        border-radius: 0.75rem;
    }

    .resume__role {
        font-size: 0.92rem;
    }

    .resume__org {
        font-size: 0.82rem;
        line-height: 1.4;
    }

    .cert-deck-container {
        height: clamp(180px, 50vw, 230px);
    }

    .cert-stack-card {
        border-radius: 1rem;
    }

    .gh-card {
        padding: 1.1rem 1rem;
        border-radius: 1.15rem;
    }

    .gh-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.4rem;
    }

    .footer {
        margin-top: 3.5rem;
        gap: 1.1rem;
    }

    .footer-nav {
        gap: 0.75rem 1rem;
        font-size: 0.85rem;
    }

    .modal-box {
        padding: 1.35rem 1.15rem;
        border-radius: 1.15rem;
    }
}

/* ==========================================================================
   Main Reading Container (below the hero runway)
   ========================================================================== */

.content-container {
    width: 100%;
    max-width: 44rem; /* 704px - pristine reading width */
    margin-inline: auto;
    padding-inline: clamp(1.25rem, 5vw, 2rem);
    padding-bottom: 6rem;
    position: relative;
    z-index: 25;
}

/* Chat Message Thread About Section (gyanl.com signature) */
.about-section {
    margin-top: clamp(1.25rem, 2.5vh, 1.75rem);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.chat__sender {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--ink-subtle);
    margin-bottom: 0.65rem;
    text-align: center;
}

.chat {
    width: 100%;
    max-width: 34rem;
}

.chat__card {
    position: relative;
    margin: 0;
    padding: 1.25rem 1.45rem;
    border-radius: var(--chat-bubble-radius);
    background: var(--chat-bubble-bg);
    color: var(--chat-bubble-fg);
    font-family: var(--font-body);
    font-size: 0.98rem;
    line-height: 1.68;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.chat__card:hover {
    transform: translateY(-2px);
    border-color: var(--ink-subtle);
}

.chat__card p {
    margin: 0;
}

.chat__stack {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.chat__bubble {
    position: relative;
    margin: 0;
    padding: 0.75rem 1.15rem;
    border-radius: var(--chat-bubble-radius);
    background: var(--chat-bubble-bg);
    color: var(--chat-bubble-fg);
    font-family: var(--font-body);
    font-size: 0.98rem;
    line-height: 1.6;
    border: 1px solid var(--line);
    transition: transform var(--transition-fast);
}

.chat__bubble:hover {
    transform: scale(1.015);
}

/* ==========================================================================
   Experience Section (.resume format from gyanl.com)
   ========================================================================== */

.section-block {
    margin-top: 4.5rem;
    width: 100%;
}

.section-heading {
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--ink);
    letter-spacing: -0.02em;
    margin-bottom: 1.35rem;
}

.resume__list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.resume__row {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 1.15rem;
    padding: 1.1rem 1.35rem;
    display: flex;
    align-items: center;
    gap: 1.15rem;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.resume__row:hover {
    transform: translateY(-2px);
    border-color: var(--ink-subtle);
}

.resume__plate {
    width: 3rem;
    height: 3rem;
    border-radius: 0.85rem;
    background: var(--bg-alt);
    border: 1px solid var(--line);
    display: grid;
    place-items: center;
    color: var(--ink);
    flex-shrink: 0;
    transition: transform var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.resume__plate svg {
    width: 1.35rem;
    height: 1.35rem;
    color: var(--ink);
    stroke-width: 2;
    transition: transform var(--transition-fast);
}

.resume__row:hover .resume__plate {
    border-color: var(--ink-muted);
}

.resume__row:hover .resume__plate svg {
    transform: scale(1.08);
}

.resume__text {
    flex: 1;
}

.resume__head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.2rem;
}

.resume__role {
    font-size: 0.98rem;
    font-weight: 700;
    color: var(--ink);
}

.resume__period {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ink-subtle);
}

.resume__org {
    font-size: 0.88rem;
    color: var(--ink-muted);
}

/* ==========================================================================
   Certificates Interactive Stack Deck (No Captions)
   ========================================================================== */

.cert-stack-hint {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ink-subtle);
    background: var(--bg-alt);
    border: 1px solid var(--line);
    padding: 0.3rem 0.65rem;
    border-radius: 9999px;
}

.cert-deck-container {
    position: relative;
    width: 100%;
    max-width: 42rem;
    height: clamp(230px, 46vw, 340px);
    margin-inline: auto;
    perspective: 1000px;
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    padding-bottom: 2rem;
}

.cert-stack-card {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    background: #0f1015;
    border: 1px solid var(--line);
    border-radius: 1.25rem;
    overflow: hidden;
    box-shadow: 0 16px 36px -8px rgba(0, 0, 0, 0.28);
    transition: transform 0.46s cubic-bezier(0.2, 0.9, 0.3, 1), opacity 0.4s ease, box-shadow 0.35s ease;
    will-change: transform, opacity;
    display: flex;
    align-items: center;
    justify-content: center;
    outline: none;
}

[data-theme="light"] .cert-stack-card {
    background: #fdfdfd;
    box-shadow: 0 14px 32px -6px rgba(0, 0, 0, 0.12);
}

.cert-stack-card img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    pointer-events: none;
    padding: 0.75rem;
    box-sizing: border-box;
}

/* 4-Layer Stacking Offsets */
.cert-stack-card[data-index="0"] {
    transform: translateY(0) scale(1) rotate(0deg);
    z-index: 4;
    opacity: 1;
    pointer-events: auto;
}

.cert-stack-card[data-index="1"] {
    transform: translateY(12px) scale(0.96) rotate(2deg);
    z-index: 3;
    opacity: 0.88;
    pointer-events: none;
}

.cert-stack-card[data-index="2"] {
    transform: translateY(22px) scale(0.92) rotate(-2.2deg);
    z-index: 2;
    opacity: 0.72;
    pointer-events: none;
}

.cert-stack-card[data-index="3"] {
    transform: translateY(30px) scale(0.88) rotate(1.2deg);
    z-index: 1;
    opacity: 0.55;
    pointer-events: none;
}

/* Hover Subtle Fan */
.cert-deck-container:hover .cert-stack-card[data-index="0"] {
    transform: translateY(-4px) scale(1.01) rotate(0deg);
    box-shadow: 0 24px 50px -10px rgba(0, 0, 0, 0.35);
}

.cert-deck-container:hover .cert-stack-card[data-index="1"] {
    transform: translateY(14px) scale(0.97) rotate(3deg) translateX(8px);
}

.cert-deck-container:hover .cert-stack-card[data-index="2"] {
    transform: translateY(24px) scale(0.93) rotate(-3.5deg) translateX(-8px);
}

.cert-deck-container:hover .cert-stack-card[data-index="3"] {
    transform: translateY(34px) scale(0.89) rotate(2deg) translateX(4px);
}

/* Card cycling transition animation */
.cert-stack-card.is-flipping {
    animation: cert-card-cycle 0.46s cubic-bezier(0.2, 0.9, 0.3, 1) forwards;
}

@keyframes cert-card-cycle {
    0% {
        transform: translateY(0) scale(1) rotate(0deg);
        opacity: 1;
        z-index: 10;
    }
    45% {
        transform: translateY(-55px) scale(1.04) rotate(-5deg);
        opacity: 0.85;
        z-index: 10;
    }
    100% {
        transform: translateY(30px) scale(0.88) rotate(1.2deg);
        opacity: 0.55;
        z-index: 1;
    }
}

/* Dots Indicator */
.cert-stack-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.cert-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--line);
    transition: all var(--transition-fast);
}

.cert-dot.is-active {
    width: 22px;
    border-radius: 9999px;
    background: #0a84ff;
}

/* ==========================================================================
   Recent Work Section (.project format from gyanl.com)
   ========================================================================== */

.project-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.project {
    display: block;
    text-decoration: none;
    color: inherit;
    border-radius: 1.35rem;
    transition: transform var(--transition-normal);
}

.project:hover {
    transform: translateY(-4px);
}

.project-media {
    position: relative;
    width: 100%;
    height: 260px;
    background: #000000;
    border-radius: 1.25rem;
    overflow: hidden;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-card);
}

.project-thumbnail {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}
    display: block;
    transition: transform var(--transition-normal);
}

.project:hover .project-thumbnail {
    transform: scale(1.03);
}

.project-body {
    margin-top: 0.85rem;
    padding-inline: 0.25rem;
}

.project-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--ink);
    letter-spacing: -0.015em;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.project-arrow {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--ink-subtle);
    transition: transform var(--transition-fast), color var(--transition-fast);
}

.project:hover .project-arrow {
    transform: translate(2px, -2px);
    color: var(--ink);
}

.project-description {
    margin-top: 0.25rem;
    font-size: 0.92rem;
    color: var(--ink-muted);
    line-height: 1.55;
}

/* ==========================================================================
   My Gear Cards Grid
   ========================================================================== */

.gear-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 600px) {
    .gear-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.gear-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 1.15rem;
    padding: 1.2rem;
    display: flex;
    align-items: flex-start;
    gap: 0.9rem;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.gear-card:hover {
    transform: translateY(-2px);
    border-color: var(--ink-subtle);
}

.gear-icon {
    font-size: 1.55rem;
    line-height: 1;
    padding: 0.45rem;
    background: var(--bg-alt);
    border-radius: 0.75rem;
    border: 1px solid var(--line);
}

.gear-details {
    flex: 1;
}

.gear-cat {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ink-subtle);
}

.gear-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--ink);
    margin-top: 0.1rem;
}

.gear-specs {
    font-size: 0.84rem;
    color: var(--ink-muted);
    margin-top: 0.15rem;
}

/* ==========================================================================
   GitHub Heatmap
   ========================================================================== */

.gh-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 1.25rem;
    padding: clamp(1.25rem, 4vw, 1.75rem);
    box-shadow: var(--shadow-card);
}

.gh-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.15rem;
}

.gh-metric {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ink-muted);
}

.gh-link {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ink);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.gh-link:hover {
    text-decoration: underline;
}

.gh-grid-scroll {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 0.35rem;
    scrollbar-width: none;
}

.gh-grid-scroll::-webkit-scrollbar {
    display: none;
}

.gh-grid-track {
    display: flex;
    gap: 3.5px;
    min-width: 640px;
    width: 100%;
}

.gh-col {
    display: flex;
    flex-direction: column;
    gap: 3.5px;
    flex: 1;
    min-width: 0;
}

.gh-cell {
    aspect-ratio: 1;
    width: 100%;
    border-radius: 2.5px;
    background-color: var(--contrib-0);
    cursor: pointer;
    transition: transform 0.12s ease;
}

.gh-cell:hover {
    transform: scale(1.4);
    z-index: 10;
}

.gh-cell.lvl-1 { background-color: var(--contrib-1); }
.gh-cell.lvl-2 { background-color: var(--contrib-2); }
.gh-cell.lvl-3 { background-color: var(--contrib-3); }
.gh-cell.lvl-4 { background-color: var(--contrib-4); }

.gh-tooltip {
    position: fixed;
    z-index: 120;
    pointer-events: none;
    background: var(--ink);
    color: var(--bg);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    padding: 0.35rem 0.65rem;
    border-radius: 0.35rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transform: translate(-50%, -130%);
    opacity: 0;
    transition: opacity 0.15s ease, transform 0.15s ease;
    white-space: nowrap;
}

.gh-tooltip.is-visible {
    opacity: 1;
}

/* ==========================================================================
   Modals
   ========================================================================== */

.modal-layer {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: grid;
    place-items: center;
    padding: 1.5rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
}

.modal-layer.is-open {
    opacity: 1;
    pointer-events: auto;
}

.modal-box {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 1.35rem;
    width: 100%;
    max-width: 38rem;
    max-height: 85vh;
    overflow-y: auto;
    padding: 1.75rem clamp(1.25rem, 4vw, 2rem);
    box-shadow: 0 20px 48px -12px rgba(0, 0, 0, 0.25);
    transform: translateY(16px) scale(0.97);
    transition: transform var(--transition-normal);
    position: relative;
}

.modal-layer.is-open .modal-box {
    transform: translateY(0) scale(1);
}

.modal-header-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--line);
    padding-bottom: 0.65rem;
}

.modal-title-text {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--ink);
}

.modal-close-btn {
    width: 2rem;
    height: 2rem;
    border-radius: 9999px;
    border: 1px solid var(--line);
    background: var(--bg-alt);
    color: var(--ink-muted);
    display: grid;
    place-items: center;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    transition: all var(--transition-fast);
}

.modal-close-btn:hover {
    color: var(--ink);
    background: var(--surface);
}

/* Music Profile Buttons in Modal */
.music-profile-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.15rem;
    border-radius: 0.75rem;
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

.music-profile-btn--apple {
    background: #fa243c;
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(250, 36, 60, 0.3);
}

.music-profile-btn--apple:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(250, 36, 60, 0.45);
}

.music-profile-btn--spotify {
    background: #1db954;
    color: #000000;
    font-weight: 700;
    box-shadow: 0 4px 14px rgba(29, 185, 84, 0.3);
}

.music-profile-btn--spotify:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(29, 185, 84, 0.45);
}

/* ==========================================================================
   Footer (gyanl.com signature)
   ========================================================================== */

.footer {
    margin-top: 5rem;
    border-top: 1px solid var(--line);
    padding-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.footer-sticker-wrap {
    margin-bottom: 0.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: flex-start;
}

.footer-cute-sticker {
    position: relative;
    display: inline-block;
    cursor: pointer;
    outline: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.footer-cute-sticker__art {
    display: block;
    width: auto;
    height: clamp(38px, 6vw, 50px);
    max-width: 85px;
    object-fit: contain;
    filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.16));
    transition: transform 0.22s cubic-bezier(0.2, 0.9, 0.3, 1), filter 0.22s ease;
}

.footer-cute-sticker.is-revealed .footer-cute-sticker__art {
    transform: translateY(-5px) scale(1.15) rotate(-4deg);
    filter: drop-shadow(0 8px 18px rgba(0, 0, 0, 0.28));
}

.footer-cute-sticker__tip {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 0;
    transform: translateY(6px) scale(0.92);
    background: #18181b;
    color: #f4f4f5;
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 500;
    padding: 0.42rem 0.85rem;
    border-radius: 9999px;
    white-space: nowrap;
    box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.12);
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    z-index: 60;
}

[data-theme="light"] .footer-cute-sticker__tip {
    background: #ffffff;
    color: #18181b;
    border-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.15);
}

.footer-cute-sticker.is-revealed .footer-cute-sticker__tip {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.footer-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.25rem;
    font-size: 0.9rem;
}

.footer-nav a {
    color: var(--ink-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-nav a:hover {
    color: var(--ink);
}

.footer-copyright {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--ink-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* ==========================================================================
   Scroll Reveal (.reveal-item)
   ========================================================================== */

.reveal-item {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal-item.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Neko Cursor Companion */
#oneko {
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}