/* gabs.feedback - Design System */
/* Colors: #FF2E8B, #2A2A3E, #0D0D14, #00F5D4, #E8E5F0, #161625, #FF6B6B, #8A86A0 */
/* Fonts: Space Grotesk, Inter, JetBrains Mono */

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

:root {
    --pink: #FF2E8B;
    --dark-blue: #2A2A3E;
    --near-black: #0D0D14;
    --cyan: #00F5D4;
    --light-gray: #E8E5F0;
    --deep-dark: #161625;
    --coral: #FF6B6B;
    --muted: #8A86A0;
    --purple: #B537F2;
    --yellow: #FFE623;
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background: var(--near-black);
    color: var(--light-gray);
    overflow-x: hidden;
    line-height: 1.6;
}

/* ============ PARTICLE CANVAS ============ */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* ============ SIDEBAR ============ */
#sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background: var(--near-black);
    border-right: 1px solid rgba(138, 134, 160, 0.15);
    z-index: 100;
    display: flex;
    flex-direction: column;
    padding: 40px 24px;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 48px;
}

.sidebar-logo {
    font-size: 32px;
    color: var(--pink);
    font-weight: 700;
    line-height: 1;
}

.sidebar-title {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    color: var(--light-gray);
    letter-spacing: -0.02em;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.nav-pill {
    display: block;
    padding: 12px 20px;
    border-radius: 100px;
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 500;
    color: var(--muted);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.nav-pill::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 100px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-pill:hover {
    color: var(--light-gray);
    background: rgba(138, 134, 160, 0.1);
}

.nav-pill:hover::before {
    opacity: 1;
}

.nav-pill.active {
    color: var(--near-black);
    background: var(--pink);
    font-weight: 600;
}

.nav-pill.active::before {
    opacity: 0;
}

@keyframes pill-ripple {
    0% { transform: scale(0); opacity: 0.5; }
    100% { transform: scale(2.5); opacity: 0; }
}

.nav-pill .ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    animation: pill-ripple 0.6s ease-out forwards;
    pointer-events: none;
}

.sidebar-footer {
    padding-top: 24px;
    border-top: 1px solid rgba(138, 134, 160, 0.15);
}

.sidebar-version {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--muted);
    opacity: 0.5;
}

/* ============ SIDEBAR TOGGLE ============ */
#sidebar-toggle {
    display: none;
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 200;
    width: 48px;
    height: 48px;
    border-radius: 100px;
    background: var(--dark-blue);
    border: 1px solid rgba(138, 134, 160, 0.2);
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: background 0.3s ease;
}

#sidebar-toggle:hover {
    background: rgba(42, 42, 62, 0.9);
}

.toggle-bar {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--light-gray);
    border-radius: 2px;
    transition: all 0.3s ease;
}

#sidebar-toggle.open .toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

#sidebar-toggle.open .toggle-bar:nth-child(2) {
    opacity: 0;
}

#sidebar-toggle.open .toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ============ MAIN CONTENT ============ */
#main-content {
    margin-left: 280px;
    position: relative;
    z-index: 2;
}

/* ============ SECTIONS ============ */
.section {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.section-inner {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 80px 60px;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 16px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(36px, 5vw, 64px);
    font-weight: 700;
    color: var(--light-gray);
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 48px;
}

.title-accent {
    color: var(--pink);
}

.gradient-divider {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--pink), var(--cyan), var(--purple));
    opacity: 0.4;
}

/* ============ HERO ============ */
.section-hero {
    flex-direction: column;
    min-height: 100vh;
    background: radial-gradient(ellipse at 50% 30%, rgba(42, 42, 62, 0.4) 0%, var(--near-black) 70%);
}

.hero-bg-char {
    position: absolute;
    font-size: 40vw;
    color: var(--light-gray);
    opacity: 0.03;
    font-weight: 700;
    line-height: 1;
    user-select: none;
    pointer-events: none;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 40px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(48px, 10vw, 120px);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--light-gray);
    line-height: 1;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--light-gray) 0%, var(--pink) 50%, var(--cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-size: clamp(16px, 2vw, 22px);
    font-weight: 300;
    color: var(--muted);
    letter-spacing: 0.05em;
}

.hero-scroll-hint {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

.hero-scroll-hint:hover {
    opacity: 1;
}

.scroll-text {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--muted);
}

.scroll-arrow {
    color: var(--cyan);
    animation: float-arrow 2s ease-in-out infinite;
}

@keyframes float-arrow {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ============ MEANING SECTION ============ */
.meaning-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.meaning-card {
    position: relative;
    background: rgba(22, 22, 37, 0.8);
    border: 1px solid rgba(138, 134, 160, 0.12);
    border-radius: 16px;
    padding: 40px 32px;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
}

.meaning-card:hover {
    transform: translateY(-4px);
    border-color: rgba(138, 134, 160, 0.3);
}

.card-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--pink);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.meaning-card:hover .card-glow {
    opacity: 1;
}

.meaning-card[data-accent="#FF2E8B"] .card-glow { background: #FF2E8B; }
.meaning-card[data-accent="#00F5D4"] .card-glow { background: #00F5D4; }
.meaning-card[data-accent="#FF6B6B"] .card-glow { background: #FF6B6B; }

.meaning-card[data-accent="#FF2E8B"]:hover { border-color: rgba(255, 46, 139, 0.3); }
.meaning-card[data-accent="#00F5D4"]:hover { border-color: rgba(0, 245, 212, 0.3); }
.meaning-card[data-accent="#FF6B6B"]:hover { border-color: rgba(255, 107, 107, 0.3); }

.meaning-korean {
    font-size: 48px;
    display: block;
    margin-bottom: 16px;
    opacity: 0.15;
    line-height: 1;
}

.meaning-word {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--light-gray);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.meaning-desc {
    font-size: 15px;
    color: var(--muted);
    line-height: 1.7;
}

/* ============ MEASUREMENT SECTION ============ */
.measurement-display {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: start;
}

.data-column {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.data-row {
    display: grid;
    grid-template-columns: 160px 1fr 60px;
    align-items: center;
    gap: 16px;
}

.data-label {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--muted);
    white-space: nowrap;
}

.data-bar {
    height: 8px;
    background: rgba(138, 134, 160, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.data-fill {
    height: 100%;
    width: 0%;
    background: var(--bar-color);
    border-radius: 4px;
    transition: width 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.data-fill.animated {
    width: calc(var(--target-width) * 1%);
}

.data-value {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 600;
    color: var(--light-gray);
    text-align: right;
}

.measurement-text p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--muted);
    margin-bottom: 20px;
}

.measurement-text em {
    color: var(--cyan);
    font-style: italic;
}

.measurement-counter {
    margin-top: 32px;
    padding: 24px;
    background: rgba(22, 22, 37, 0.6);
    border: 1px solid rgba(138, 134, 160, 0.12);
    border-radius: 12px;
    text-align: center;
}

.counter-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--muted);
    margin-bottom: 8px;
}

.counter-value {
    font-family: var(--font-mono);
    font-size: 48px;
    font-weight: 600;
    color: var(--cyan);
    letter-spacing: -0.02em;
}

/* ============ FEEDBACK LOOP SECTION ============ */
.loop-visualization {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.loop-ring {
    position: relative;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.loop-svg {
    width: 100%;
    height: auto;
}

.loop-track {
    fill: none;
    stroke: rgba(138, 134, 160, 0.1);
    stroke-width: 3;
}

.loop-progress {
    fill: none;
    stroke: var(--pink);
    stroke-width: 3;
    stroke-dasharray: 1005;
    stroke-dashoffset: 1005;
    stroke-linecap: round;
    transition: stroke-dashoffset 2s cubic-bezier(0.16, 1, 0.3, 1);
    transform: rotate(-90deg);
    transform-origin: center;
}

.loop-progress.animated {
    stroke-dashoffset: 100;
}

.loop-inner-track {
    fill: none;
    stroke: rgba(138, 134, 160, 0.06);
    stroke-width: 2;
}

.loop-inner-progress {
    fill: none;
    stroke: var(--cyan);
    stroke-width: 2;
    stroke-dasharray: 754;
    stroke-dashoffset: 754;
    stroke-linecap: round;
    transition: stroke-dashoffset 2.5s cubic-bezier(0.16, 1, 0.3, 1) 0.3s;
    transform: rotate(-90deg);
    transform-origin: center;
}

.loop-inner-progress.animated {
    stroke-dashoffset: 75;
}

.loop-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.loop-symbol {
    display: block;
    font-size: 48px;
    color: var(--light-gray);
    line-height: 1;
    margin-bottom: 4px;
}

.loop-label-text {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--muted);
}

.loop-stages {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.stage {
    padding: 24px;
    border-left: 2px solid rgba(138, 134, 160, 0.15);
    transition: all 0.4s ease;
    opacity: 0.6;
}

.stage.active-stage {
    opacity: 1;
    border-left-color: var(--pink);
}

.stage-number {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--pink);
    font-weight: 600;
    margin-bottom: 8px;
}

.stage-title {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    color: var(--light-gray);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.stage-desc {
    font-size: 14px;
    color: var(--muted);
    line-height: 1.7;
}

/* ============ ARCHITECTURE SECTION ============ */
.architecture-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.arch-block {
    padding: 40px 32px;
    background: rgba(22, 22, 37, 0.6);
    border: 1px solid rgba(138, 134, 160, 0.12);
    border-radius: 16px;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.arch-block:hover {
    transform: translateY(-4px);
    background: rgba(22, 22, 37, 0.9);
}

.arch-block[data-accent="#FF2E8B"]:hover { border-color: rgba(255, 46, 139, 0.3); }
.arch-block[data-accent="#00F5D4"]:hover { border-color: rgba(0, 245, 212, 0.3); }
.arch-block[data-accent="#FF6B6B"]:hover { border-color: rgba(255, 107, 107, 0.3); }
.arch-block[data-accent="#B537F2"]:hover { border-color: rgba(181, 55, 242, 0.3); }

.arch-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 24px;
    color: var(--muted);
    transition: color 0.3s ease;
}

.arch-block[data-accent="#FF2E8B"]:hover .arch-icon { color: #FF2E8B; }
.arch-block[data-accent="#00F5D4"]:hover .arch-icon { color: #00F5D4; }
.arch-block[data-accent="#FF6B6B"]:hover .arch-icon { color: #FF6B6B; }
.arch-block[data-accent="#B537F2"]:hover .arch-icon { color: #B537F2; }

.arch-block h3 {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    color: var(--light-gray);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.arch-block p {
    font-size: 15px;
    color: var(--muted);
    line-height: 1.7;
}

/* ============ CONTACT SECTION ============ */
.section-contact {
    background: radial-gradient(ellipse at 50% 70%, rgba(42, 42, 62, 0.3) 0%, var(--near-black) 70%);
}

.contact-intro {
    font-size: 18px;
    color: var(--muted);
    max-width: 500px;
    margin-bottom: 48px;
    line-height: 1.7;
}

.contact-form-wrapper {
    max-width: 600px;
}

.contact-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group-full {
    grid-column: 1 / -1;
}

.contact-form label {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--muted);
}

.contact-form input,
.contact-form textarea {
    background: rgba(22, 22, 37, 0.6);
    border: 1px solid rgba(138, 134, 160, 0.2);
    border-radius: 8px;
    padding: 14px 18px;
    font-family: var(--font-body);
    font-size: 15px;
    color: var(--light-gray);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    outline: none;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: rgba(138, 134, 160, 0.4);
}

.contact-form input:hover,
.contact-form textarea:hover {
    border-color: rgba(138, 134, 160, 0.4);
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--pink);
    box-shadow: 0 0 0 3px rgba(255, 46, 139, 0.1);
}

.contact-form textarea {
    resize: vertical;
    min-height: 100px;
}

.submit-btn {
    grid-column: 1 / -1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 40px;
    background: var(--pink);
    color: #fff;
    border: none;
    border-radius: 100px;
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    max-width: 240px;
}

.submit-btn:hover {
    background: #e0247a;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 46, 139, 0.3);
}

.btn-arrow {
    transition: transform 0.3s ease;
    font-size: 20px;
}

.submit-btn:hover .btn-arrow {
    transform: translateX(4px);
}

.contact-footer {
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid rgba(138, 134, 160, 0.1);
}

.footer-domain {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--light-gray);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.footer-tagline {
    font-family: var(--font-body);
    font-size: 14px;
    color: var(--muted);
}

/* ============ SCROLL REVEAL ============ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
    #sidebar {
        transform: translateX(-100%);
    }

    #sidebar.open {
        transform: translateX(0);
    }

    #sidebar-toggle {
        display: flex;
    }

    #main-content {
        margin-left: 0;
    }

    .section-inner {
        padding: 60px 32px;
    }

    .meaning-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .measurement-display {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .data-row {
        grid-template-columns: 120px 1fr 50px;
    }

    .loop-visualization {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .loop-ring {
        max-width: 300px;
    }

    .architecture-grid {
        grid-template-columns: 1fr;
    }

    .contact-form {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .section-inner {
        padding: 40px 20px;
    }

    .hero-title {
        font-size: clamp(36px, 12vw, 80px);
    }

    .section-title {
        font-size: clamp(28px, 6vw, 48px);
    }

    .data-row {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    .data-bar {
        width: 100%;
    }

    .data-value {
        text-align: left;
    }

    .hero-scroll-hint {
        bottom: 30px;
    }

    .hero-bg-char {
        font-size: 60vw;
    }
}