/* ==========================================================================
   DESIGN TOKENS & VARIABLES (THEMES)
   ========================================================================== */
:root {
    /* Fonts */
    --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-display: 'Playfair Display', Georgia, Cambria, 'Times New Roman', Times, serif;

    /* Transition speeds */
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-quick: all 0.2s ease;
    --radius-lg: 24px;
    --radius-md: 12px;
    --radius-sm: 8px;

    /* Feedback Colors (Unified) */
    --color-error: #ef4444;
    --color-success: #10b981;
}

/* -------------------------------------------------------------
   DARK THEME (Default)
   ------------------------------------------------------------- */
html[data-theme="dark"] {
    --bg-dark: #090d16;
    --bg-gradient-start: #080f21;
    --bg-gradient-end: #010307;
    
    --text-primary: #ffffff;
    --text-muted: #94a3b8;
    --text-dark: #090d16;
    
    --brand-primary: #ffffff;
    --logo-grad-start: #ffffff;
    --logo-grad-end: #475569;
    
    --glass-bg: rgba(15, 23, 42, 0.45);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-hover: rgba(255, 255, 255, 0.18);
    --glass-border-focus: rgba(255, 255, 255, 0.35);
    
    --glow-subtle: 0 0 15px rgba(255, 255, 255, 0.05);
    --glow-medium: 0 0 25px rgba(255, 255, 255, 0.15);
    --glow-text: 0 0 8px rgba(255, 255, 255, 0.2);
    
    --accent-gradient: linear-gradient(135deg, #ffffff 0%, #cbd5e1 50%, #64748b 100%);
    --badge-bg: rgba(255, 255, 255, 0.05);
    --badge-border: rgba(255, 255, 255, 0.15);
    --badge-text: #ffffff;
    
    --btn-bg: linear-gradient(135deg, #ffffff 0%, #f1f5f9 50%, #cbd5e1 100%);
    --btn-text: #090d16;
    --btn-shadow: 0 4px 15px rgba(255, 255, 255, 0.08);
    --btn-hover-shadow: 0 6px 20px rgba(255, 255, 255, 0.22);
    
    --input-bg: rgba(255, 255, 255, 0.03);
    --social-hover-bg: rgba(255, 255, 255, 0.06);
    --social-hover-border: rgba(255, 255, 255, 0.35);
    
    --particles-gradient: radial-gradient(circle, rgba(255, 255, 255, 0.35) 0%, rgba(255, 255, 255, 0) 70%);
    --bg-overlay-radial: radial-gradient(circle at 50% 50%, rgba(8, 15, 33, 0.72) 0%, rgba(2, 4, 8, 0.98) 100%);
    --toggle-icon-color: #ffffff;
}

/* -------------------------------------------------------------
   LIGHT THEME
   ------------------------------------------------------------- */
html[data-theme="light"] {
    --bg-dark: #f8fafc;
    --bg-gradient-start: #ffffff;
    --bg-gradient-end: #f1f5f9;
    
    --text-primary: #0f172a;
    --text-muted: #475569;
    --text-dark: #ffffff;
    
    --brand-primary: #0f172a;
    --logo-grad-start: #0f172a;
    --logo-grad-end: #475569;
    
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(15, 23, 42, 0.08);
    --glass-border-hover: rgba(15, 23, 42, 0.18);
    --glass-border-focus: rgba(15, 23, 42, 0.35);
    
    --glow-subtle: 0 0 15px rgba(15, 23, 42, 0.03);
    --glow-medium: 0 0 25px rgba(15, 23, 42, 0.08);
    --glow-text: none;
    
    --accent-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #475569 100%);
    --badge-bg: rgba(15, 23, 42, 0.05);
    --badge-border: rgba(15, 23, 42, 0.15);
    --badge-text: #0f172a;
    
    --btn-bg: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #475569 100%);
    --btn-text: #ffffff;
    --btn-shadow: 0 4px 15px rgba(15, 23, 42, 0.15);
    --btn-hover-shadow: 0 6px 20px rgba(15, 23, 42, 0.3);
    
    --input-bg: rgba(15, 23, 42, 0.02);
    --social-hover-bg: rgba(15, 23, 42, 0.05);
    --social-hover-border: rgba(15, 23, 42, 0.35);
    
    --particles-gradient: radial-gradient(circle, rgba(15, 23, 42, 0.15) 0%, rgba(15, 23, 42, 0) 70%);
    --bg-overlay-radial: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.6) 0%, rgba(241, 245, 249, 0.94) 100%);
    --toggle-icon-color: #0f172a;
}

/* ==========================================================================
   RESET & SYSTEM STYLES
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    transition: background-color 0.5s ease;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.5s ease, color 0.5s ease;
}

/* Screen reader only helper class */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ==========================================================================
   THEME TOGGLE BUTTON
   ========================================================================== */
.theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--toggle-icon-color);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: var(--glow-subtle);
    transition: var(--transition-smooth);
    outline: none;
}

.theme-toggle:hover {
    border-color: var(--glass-border-hover);
    box-shadow: var(--glow-medium);
    transform: scale(1.08) rotate(15deg);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Toggle Sun/Moon display states */
html[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}
html[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}
html[data-theme="light"] .theme-toggle .sun-icon {
    display: none;
}
html[data-theme="light"] .theme-toggle .moon-icon {
    display: block;
}

/* ==========================================================================
   BACKGROUNDS & DECORATIONS
   ========================================================================== */
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('assets/bg.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: -3;
    animation: bgDrift 40s ease-in-out infinite alternate;
}

.background-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay-radial);
    z-index: -2;
    transition: background 0.5s ease;
}

.particles-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
    pointer-events: none;
}

.particle {
    position: absolute;
    background: var(--particles-gradient);
    border-radius: 50%;
    pointer-events: none;
    animation: floatUp 10s infinite linear;
}

/* ==========================================================================
   LAYOUT: GLASS CARD
   ========================================================================== */
.page-container {
    width: 100%;
    max-width: 680px;
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(24px) saturate(160%);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card), var(--glow-subtle);
    padding: 3rem 2.5rem;
    width: 100%;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    animation: cardAppear 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    transform: translateY(30px);
    opacity: 0;
    transition: background 0.5s ease, border-color 0.5s ease, box-shadow 0.5s ease;
}

/* ==========================================================================
   CARD HEADER: BRAND/LOGO
   ========================================================================== */
.card-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.logo-wrapper {
    position: relative;
    width: 80px;
    height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: logoGlow 6s ease-in-out infinite alternate;
}

.logo-svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(var(--glow-medium));
    transition: filter 0.5s ease;
}

.brand-title {
    font-family: var(--font-body);
    font-size: 1.15rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.25em;
    color: var(--text-primary);
    opacity: 0.95;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: color 0.5s ease;
}

/* ==========================================================================
   CARD BODY: COPYWRITING & BADGES
   ========================================================================== */
.card-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.badge {
    background: var(--badge-bg);
    border: 1px solid var(--badge-border);
    color: var(--badge-text);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    padding: 0.35rem 1rem;
    border-radius: 50px;
    animation: pulseBorder 3s infinite alternate;
    transition: background-color 0.5s ease, border-color 0.5s ease, color 0.5s ease;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 2.85rem;
    line-height: 1.2;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    transition: color 0.5s ease;
}

.accent-text {
    font-style: italic;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 2px 10px rgba(255, 255, 255, 0.05));
}

.hero-description {
    font-size: 0.98rem;
    line-height: 1.6;
    color: var(--text-muted);
    max-width: 480px;
    margin: 0 auto;
    font-weight: 300;
    transition: color 0.5s ease;
}

/* ==========================================================================
   COUNTDOWN TIMER
   ========================================================================== */
.countdown-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    margin: 1rem 0;
    width: 100%;
    max-width: 450px;
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md);
    padding: 1.25rem 1rem;
}

.countdown-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.countdown-num {
    font-family: var(--font-body);
    font-size: 2.25rem;
    font-weight: 600;
    color: var(--text-primary);
    text-shadow: var(--glow-text);
    min-width: 3rem;
    letter-spacing: -0.02em;
    transition: var(--transition-quick);
}

.countdown-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 0.25rem;
    transition: color 0.5s ease;
}

.countdown-divider {
    font-family: var(--font-body);
    font-size: 1.75rem;
    color: var(--text-primary);
    opacity: 0.4;
    transform: translateY(-8px);
    animation: blink 1.5s infinite;
    transition: color 0.5s ease;
}

/* ==========================================================================
   NEWSLETTER SIGNUP FORM
   ========================================================================== */
.signup-container {
    width: 100%;
    max-width: 450px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.signup-callout {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 400;
    transition: color 0.5s ease;
}

.subscribe-form {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
}

.input-group {
    display: flex;
    position: relative;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 4px;
    width: 100%;
    transition: var(--transition-smooth);
}

.input-group:hover {
    border-color: var(--glass-border-hover);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.03);
}

.input-group.focused {
    border-color: var(--glass-border-focus);
    box-shadow: var(--glow-subtle);
    background: rgba(255, 255, 255, 0.02);
}

.email-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    padding: 0.75rem 1rem;
    width: 100%;
}

.email-input::placeholder {
    color: var(--text-muted);
    opacity: 0.5;
}

.submit-btn {
    background: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    outline: none;
    border-radius: calc(var(--radius-md) - 2px);
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
    transition: var(--transition-smooth);
    box-shadow: var(--btn-shadow);
}

.submit-btn span {
    z-index: 2;
    transition: var(--transition-smooth);
}

.arrow-icon {
    width: 16px;
    height: 16px;
    z-index: 2;
    transition: var(--transition-smooth);
}

/* Button hover interaction */
.submit-btn:hover {
    box-shadow: var(--btn-hover-shadow);
    transform: translateY(-1px);
    opacity: 0.95;
}

.submit-btn:hover .arrow-icon {
    transform: translateX(3px);
}

.submit-btn:active {
    transform: translateY(1px);
}

/* Button disabled/loading state */
.submit-btn.loading {
    pointer-events: none;
    opacity: 0.8;
}

.submit-btn.loading span {
    transform: translateY(-30px);
    opacity: 0;
}

.submit-btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: calc(50% - 8px);
    left: calc(50% - 8px);
    border: 2px solid var(--btn-text);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spinner 0.6s linear infinite;
    z-index: 3;
}

/* Feedback messages with animations */
.form-feedback {
    font-size: 0.8rem;
    margin-top: 0.25rem;
    text-align: left;
    padding-left: 0.75rem;
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    font-weight: 500;
}

.form-feedback.show-msg {
    opacity: 1;
    max-height: 40px;
    margin-top: 0.5rem;
}

.form-feedback.success {
    color: var(--color-success);
}

.form-feedback.error {
    color: var(--color-error);
}

/* ==========================================================================
   CARD FOOTER: SOCIAL LINKS & COPYRIGHT
   ========================================================================== */
.card-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    border-top: 1px solid var(--glass-border);
    padding-top: 1.5rem;
    transition: border-color 0.5s ease;
}

.social-links {
    display: flex;
    gap: 0.75rem;
}

.social-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.social-btn svg {
    width: 18px;
    height: 18px;
    transition: var(--transition-smooth);
}

/* Social Hover Micro-Interactions */
.social-btn:hover {
    color: var(--text-primary);
    background: var(--social-hover-bg);
    border-color: var(--social-hover-border);
    box-shadow: var(--glow-subtle);
    transform: translateY(-3px);
}

.social-btn:hover svg {
    transform: scale(1.1);
}

.copyright {
    font-size: 0.78rem;
    color: var(--text-muted);
    opacity: 0.6;
    letter-spacing: 0.02em;
    transition: color 0.5s ease;
}

/* ==========================================================================
   ANIMATIONS & KEYFRAMES
   ========================================================================== */
@keyframes cardAppear {
    from {
        transform: translateY(35px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes bgDrift {
    0% {
        transform: scale(1) translate(0, 0);
    }
    50% {
        transform: scale(1.05) translate(-1%, -1%);
    }
    100% {
        transform: scale(1.02) translate(1%, 0.5%);
    }
}

@keyframes floatUp {
    0% {
        transform: translateY(100vh) translateX(0) scale(0.5);
        opacity: 0;
    }
    15% {
        opacity: 0.8;
    }
    90% {
        opacity: 0.6;
    }
    100% {
        transform: translateY(-100px) translateX(var(--drift, 50px)) scale(1.2);
        opacity: 0;
    }
}

@keyframes logoGlow {
    0% {
        filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.08));
    }
    100% {
        filter: drop-shadow(0 0 16px rgba(255, 255, 255, 0.22));
    }
}

@keyframes pulseBorder {
    0% {
        border-color: var(--badge-border);
        box-shadow: 0 0 5px rgba(255, 255, 255, 0.01);
    }
    100% {
        border-color: var(--text-muted);
        box-shadow: var(--glow-subtle);
    }
}

@keyframes blink {
    0%, 100% {
        opacity: 0.15;
    }
    50% {
        opacity: 0.65;
    }
}

@keyframes spinner {
    to {
        transform: rotate(360deg);
    }
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES
   ========================================================================== */
@media (max-width: 600px) {
    .glass-card {
        padding: 2.25rem 1.5rem;
        gap: 1.75rem;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .countdown-container {
        padding: 1rem 0.5rem;
        gap: 0.35rem;
    }

    .countdown-num {
        font-size: 1.75rem;
        min-width: 2.25rem;
    }

    .countdown-divider {
        font-size: 1.25rem;
        transform: translateY(-5px);
    }

    .countdown-label {
        font-size: 0.65rem;
    }

    .email-input {
        padding: 0.65rem 0.75rem;
        font-size: 0.9rem;
    }

    .submit-btn {
        padding: 0 1.25rem;
        font-size: 0.85rem;
    }
}

@media (max-width: 400px) {
    .hero-title {
        font-size: 1.85rem;
    }

    .input-group {
        flex-direction: column;
        background: transparent;
        border: none;
        padding: 0;
        gap: 0.5rem;
    }

    .input-group:hover, .input-group.focused {
        box-shadow: none;
        background: transparent;
    }

    .email-input {
        background: var(--input-bg);
        border: 1px solid var(--glass-border);
        border-radius: var(--radius-md);
        padding: 0.75rem 1rem;
    }

    .submit-btn {
        padding: 0.75rem 1.5rem;
        border-radius: var(--radius-md);
        width: 100%;
    }
}