/* ========================================
   Material Design 3 - Design Tokens
   ======================================== */

:root {
    /* MD3 Light Theme - Tonal Palette based on Primary #6750A4 */
    --md-sys-color-primary: #6750A4;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;
    --md-sys-color-secondary: #625B71;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #E8DEF8;
    --md-sys-color-on-secondary-container: #1D192B;
    --md-sys-color-tertiary: #7D5260;
    --md-sys-color-on-tertiary: #FFFFFF;
    --md-sys-color-tertiary-container: #FFD8E4;
    --md-sys-color-on-tertiary-container: #31111D;
    --md-sys-color-error: #B3261E;
    --md-sys-color-on-error: #FFFFFF;
    --md-sys-color-error-container: #F9DEDC;
    --md-sys-color-on-error-container: #410E0B;
    --md-sys-color-background: #FEF7FF;
    --md-sys-color-on-background: #1D1B20;
    --md-sys-color-surface: #FEF7FF;
    --md-sys-color-on-surface: #1D1B20;
    --md-sys-color-surface-variant: #E7E0EC;
    --md-sys-color-on-surface-variant: #49454F;
    --md-sys-color-outline: #79747E;
    --md-sys-color-outline-variant: #CAC4D0;
    --md-sys-color-inverse-surface: #322F35;
    --md-sys-color-inverse-on-surface: #F5EFF7;
    --md-sys-color-inverse-primary: #D0BCFF;
    --md-sys-color-surface-container-lowest: #FFFFFF;
    --md-sys-color-surface-container-low: #F7F2FA;
    --md-sys-color-surface-container: #F3EDF7;
    --md-sys-color-surface-container-high: #ECE6F0;
    --md-sys-color-surface-container-highest: #E6E0E9;

    /* MD3 Elevation */
    --md-sys-elevation-1: 0px 1px 2px rgba(0, 0, 0, 0.3), 0px 1px 3px 1px rgba(0, 0, 0, 0.15);
    --md-sys-elevation-2: 0px 1px 2px rgba(0, 0, 0, 0.3), 0px 2px 6px 2px rgba(0, 0, 0, 0.15);
    --md-sys-elevation-3: 0px 4px 8px 3px rgba(0, 0, 0, 0.15), 0px 1px 3px rgba(0, 0, 0, 0.3);

    /* MD3 Shape */
    --md-sys-shape-corner-small: 8px;
    --md-sys-shape-corner-medium: 12px;
    --md-sys-shape-corner-large: 16px;
    --md-sys-shape-corner-extra-large: 28px;
    --md-sys-shape-corner-full: 9999px;

    /* Typography */
    --md-sys-typescale-display-large: 500 57px/64px 'Noto Sans SC', 'Roboto', sans-serif;
    --md-sys-typescale-headline-medium: 400 28px/36px 'Noto Sans SC', 'Roboto', sans-serif;
    --md-sys-typescale-body-large: 400 16px/24px 'Noto Sans SC', 'Roboto', sans-serif;
    --md-sys-typescale-body-medium: 400 14px/20px 'Noto Sans SC', 'Roboto', sans-serif;
    --md-sys-typescale-label-large: 500 14px/20px 'Noto Sans SC', 'Roboto', sans-serif;

    /* Motion */
    --md-sys-motion-duration-short: 200ms;
    --md-sys-motion-duration-medium: 400ms;
    --md-sys-motion-duration-long: 600ms;
    --md-sys-motion-easing-emphasized: cubic-bezier(0.2, 0, 0, 1);
    --md-sys-motion-easing-emphasized-decelerate: cubic-bezier(0.05, 0.7, 0.1, 1);
    --md-sys-motion-easing-emphasized-accelerate: cubic-bezier(0.3, 0, 0.8, 0.15);
    --md-sys-motion-easing-standard: cubic-bezier(0.2, 0, 0, 1);
}

/* ========================================
   Dark Theme
   ======================================== */
[data-theme="dark"] {
    --md-sys-color-primary: #D0BCFF;
    --md-sys-color-on-primary: #381E72;
    --md-sys-color-primary-container: #4F378B;
    --md-sys-color-on-primary-container: #EADDFF;
    --md-sys-color-secondary: #CCC2DC;
    --md-sys-color-on-secondary: #332D41;
    --md-sys-color-secondary-container: #4A4458;
    --md-sys-color-on-secondary-container: #E8DEF8;
    --md-sys-color-tertiary: #EFB8C8;
    --md-sys-color-on-tertiary: #492532;
    --md-sys-color-tertiary-container: #633B48;
    --md-sys-color-on-tertiary-container: #FFD8E4;
    --md-sys-color-error: #F2B8B5;
    --md-sys-color-on-error: #601410;
    --md-sys-color-error-container: #8C1D18;
    --md-sys-color-on-error-container: #F9DEDC;
    --md-sys-color-background: #141218;
    --md-sys-color-on-background: #E6E0E9;
    --md-sys-color-surface: #141218;
    --md-sys-color-on-surface: #E6E0E9;
    --md-sys-color-surface-variant: #49454F;
    --md-sys-color-on-surface-variant: #CAC4D0;
    --md-sys-color-outline: #938F99;
    --md-sys-color-outline-variant: #49454F;
    --md-sys-color-inverse-surface: #E6E0E9;
    --md-sys-color-inverse-on-surface: #322F35;
    --md-sys-color-inverse-primary: #6750A4;
    --md-sys-color-surface-container-lowest: #0F0D13;
    --md-sys-color-surface-container-low: #1D1B20;
    --md-sys-color-surface-container: #211F26;
    --md-sys-color-surface-container-high: #2B2930;
    --md-sys-color-surface-container-highest: #36343B;

    --md-sys-elevation-1: 0px 1px 3px 1px rgba(0, 0, 0, 0.4), 0px 1px 2px rgba(0, 0, 0, 0.6);
    --md-sys-elevation-2: 0px 2px 6px 2px rgba(0, 0, 0, 0.4), 0px 1px 2px rgba(0, 0, 0, 0.6);
    --md-sys-elevation-3: 0px 4px 8px 3px rgba(0, 0, 0, 0.4), 0px 1px 3px rgba(0, 0, 0, 0.6);
}

/* ========================================
   Reset & Base
   ======================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font: var(--md-sys-typescale-body-large);
    background-color: var(--md-sys-color-background);
    color: var(--md-sys-color-on-background);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard),
        color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
    overflow-x: hidden;
}

/* Background decoration */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 30% 20%,
            color-mix(in srgb, var(--md-sys-color-primary) 8%, transparent) 0%,
            transparent 50%),
        radial-gradient(ellipse at 70% 80%,
            color-mix(in srgb, var(--md-sys-color-tertiary) 6%, transparent) 0%,
            transparent 50%);
    z-index: -1;
    animation: bgShift 20s ease-in-out infinite alternate;
}

@keyframes bgShift {
    0% {
        transform: translate(0, 0);
    }

    100% {
        transform: translate(-5%, -3%);
    }
}

/* ========================================
   Language Switcher
   ======================================== */
.lang-switcher {
    position: fixed;
    top: 20px;
    left: 24px;
    display: flex;
    align-items: center;
    gap: 4px;
    z-index: 100;
    background: var(--md-sys-color-surface-container);
    padding: 6px 14px;
    border-radius: var(--md-sys-shape-corner-full);
    box-shadow: var(--md-sys-elevation-1);
    transition: background-color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

.lang-btn {
    border: none;
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    font: var(--md-sys-typescale-label-large);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--md-sys-shape-corner-full);
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.lang-btn:hover {
    background: var(--md-sys-color-surface-container-highest);
}

.lang-btn.active {
    color: var(--md-sys-color-on-primary);
    background: var(--md-sys-color-primary);
}

.lang-divider {
    color: var(--md-sys-color-outline);
    font-size: 12px;
    user-select: none;
}

/* ========================================
   Theme Toggle
   ======================================== */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 24px;
    z-index: 100;
    width: 48px;
    height: 48px;
    border-radius: var(--md-sys-shape-corner-full);
    border: none;
    background: var(--md-sys-color-surface-container);
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--md-sys-elevation-1);
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.theme-toggle:hover {
    background: var(--md-sys-color-surface-container-highest);
    box-shadow: var(--md-sys-elevation-2);
}

.theme-toggle:active {
    transform: scale(0.92);
}

.theme-toggle .material-symbols-outlined {
    font-size: 24px;
    transition: transform var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-emphasized);
}

[data-theme="dark"] .theme-toggle .material-symbols-outlined {
    transform: rotate(360deg);
}

/* ========================================
   Main Container
   ======================================== */
.main-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 24px;
    width: 100%;
    max-width: 560px;
    animation: fadeInUp var(--md-sys-motion-duration-long) var(--md-sys-motion-easing-emphasized-decelerate);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(32px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   MD3 Card
   ======================================== */
.md3-card {
    width: 100%;
    background: var(--md-sys-color-surface-container-low);
    border-radius: var(--md-sys-shape-corner-extra-large);
    padding: 48px 40px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: var(--md-sys-elevation-1);
    transition: background-color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard),
        box-shadow var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
    position: relative;
    overflow: hidden;
}

.md3-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg,
            var(--md-sys-color-primary),
            var(--md-sys-color-tertiary),
            var(--md-sys-color-primary));
    background-size: 200% 100%;
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {

    0%,
    100% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }
}

.md3-card:hover {
    box-shadow: var(--md-sys-elevation-2);
}

/* ========================================
   Avatar
   ======================================== */
.avatar-wrapper {
    position: relative;
    width: 140px;
    height: 140px;
    margin-bottom: 24px;
}

.avatar-ring {
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: linear-gradient(135deg,
            var(--md-sys-color-primary),
            var(--md-sys-color-tertiary),
            var(--md-sys-color-secondary),
            var(--md-sys-color-primary));
    background-size: 300% 300%;
    animation: ringRotate 6s ease-in-out infinite;
    opacity: 0.8;
}

@keyframes ringRotate {

    0%,
    100% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }
}

.avatar {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    position: relative;
    z-index: 1;
    border: 4px solid var(--md-sys-color-surface-container-low);
    transition: transform var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-emphasized),
        border-color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

.avatar:hover {
    transform: scale(1.05);
}

/* ========================================
   Name
   ======================================== */
.display-name {
    font: var(--md-sys-typescale-headline-medium);
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
    margin-bottom: 12px;
    letter-spacing: 0.5px;
    transition: color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

/* ========================================
   Bio
   ======================================== */
.bio {
    font: var(--md-sys-typescale-body-large);
    color: var(--md-sys-color-on-surface-variant);
    text-align: center;
    line-height: 1.6;
    max-width: 400px;
    margin-bottom: 24px;
    transition: color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

/* ========================================
   Divider
   ======================================== */
.md3-divider {
    width: 80%;
    height: 1px;
    background: var(--md-sys-color-outline-variant);
    margin-bottom: 28px;
    transition: background-color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

/* ========================================
   Links Section
   ======================================== */
.links-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
}

/* MD3 Tonal Button / Link Chip */
.md3-link-chip {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    border-radius: var(--md-sys-shape-corner-large);
    background: var(--md-sys-color-surface-container);
    color: var(--md-sys-color-on-surface);
    text-decoration: none;
    font: var(--md-sys-typescale-label-large);
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
    position: relative;
    overflow: hidden;
}

.md3-link-chip::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--md-sys-color-on-surface);
    opacity: 0;
    transition: opacity var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.md3-link-chip:hover::before {
    opacity: 0.08;
}

.md3-link-chip:active::before {
    opacity: 0.12;
}

.md3-link-chip:hover {
    box-shadow: var(--md-sys-elevation-1);
    transform: translateY(-1px);
}

.md3-link-chip:active {
    transform: translateY(0);
}

.chip-icon {
    color: var(--md-sys-color-primary);
    font-size: 22px;
    flex-shrink: 0;
    transition: color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

.chip-label {
    flex: 1;
    transition: color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

/* Ripple effect */
.md3-link-chip .ripple {
    position: absolute;
    border-radius: 50%;
    background: var(--md-sys-color-primary);
    opacity: 0.2;
    transform: scale(0);
    animation: rippleAnim 0.6s ease-out;
    pointer-events: none;
}

@keyframes rippleAnim {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* ========================================
   Footer
   ======================================== */
.footer {
    margin-top: 32px;
    text-align: center;
}

.footer p {
    font: var(--md-sys-typescale-body-medium);
    color: var(--md-sys-color-outline);
    transition: color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 480px) {
    .md3-card {
        padding: 36px 24px 32px;
        border-radius: var(--md-sys-shape-corner-large);
    }

    .avatar-wrapper {
        width: 110px;
        height: 110px;
    }

    .avatar {
        width: 110px;
        height: 110px;
    }

    .avatar-ring {
        inset: -3px;
    }

    .display-name {
        font-size: 24px;
    }

    .bio {
        font-size: 14px;
    }

    .md3-link-chip {
        padding: 14px 20px;
    }

    .lang-switcher {
        top: 12px;
        left: 12px;
        padding: 4px 10px;
    }

    .theme-toggle {
        top: 12px;
        right: 12px;
        width: 40px;
        height: 40px;
    }
}

/* ========================================
   Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}