/* CSS Variables - Binance Theme */
:root {
    --binance-yellow: #F0B90B;
    --binance-yellow-light: #FCD535;
    --binance-yellow-dark: #C99400;
    --binance-black: #0B0E11;
    --binance-dark: #121318;
    --binance-gray-900: #181A20;
    --binance-gray-800: #1E2329;
    --binance-gray-700: #2B3139;
    --binance-gray-600: #3C4046;
    --binance-gray-500: #5E6673;
    --binance-gray-400: #848E9C;
    --binance-gray-300: #B7BDC6;
    --binance-gray-200: #D4D8DC;
    --binance-white: #FFFFFF;
    
    --gradient-gold: linear-gradient(135deg, #F0B90B 0%, #FCD535 50%, #F0B90B 100%);
    --gradient-dark: linear-gradient(180deg, #0B0E11 0%, #181A20 100%);
    --gradient-card: linear-gradient(145deg, rgba(30, 35, 41, 0.8) 0%, rgba(24, 26, 32, 0.9) 100%);
    
    --shadow-gold: 0 4px 30px rgba(240, 185, 11, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    
    --font-main: 'Space Grotesk', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--binance-black);
    color: var(--binance-white);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Effects */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(240, 185, 11, 0.3) 0%, transparent 70%);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(252, 213, 53, 0.2) 0%, transparent 70%);
    bottom: -150px;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(240, 185, 11, 0.15) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(20px, 10px) scale(1.02); }
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(240, 185, 11, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(240, 185, 11, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 48px;
    position: relative;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.binance-logo {
    height: 32px;
    width: auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.twitter-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    border: 1px solid var(--binance-gray-600);
    padding: 8px 16px;
    border-radius: 100px;
    color: var(--binance-white);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.twitter-btn:hover {
    background: var(--binance-gray-800);
    border-color: var(--binance-yellow);
    color: var(--binance-yellow);
}

.twitter-btn svg {
    width: 18px;
    height: 18px;
}

.header-badge {
    background: var(--binance-gray-800);
    padding: 8px 16px;
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--binance-gray-300);
    border: 1px solid var(--binance-gray-700);
}

/* Tweet Section */
.tweet-section {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
}

.tweet-section .twitter-tweet {
    margin: 0 auto !important;
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px 80px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 40px 0 60px;
}

.title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
}

.title-gradient {
    background: linear-gradient(135deg, var(--binance-gray-200) 0%, var(--binance-white) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-highlight {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.title-highlight::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 4px;
    background: var(--gradient-gold);
    border-radius: 2px;
    opacity: 0.3;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--binance-gray-400);
    max-width: 600px;
    margin: 0 auto;
}

/* Upload Section */
.upload-section {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.upload-container {
    background: var(--gradient-card);
    border: 1px solid var(--binance-gray-700);
    border-radius: var(--border-radius);
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.upload-area {
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px dashed transparent;
    margin: 16px;
    border-radius: var(--border-radius-sm);
    position: relative;
}

.upload-area:hover {
    border-color: var(--binance-yellow);
    background: rgba(240, 185, 11, 0.05);
}

.upload-area.dragover {
    border-color: var(--binance-yellow);
    background: rgba(240, 185, 11, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    color: var(--binance-yellow);
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.upload-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--binance-white);
}

.upload-text {
    color: var(--binance-gray-400);
    margin-bottom: 16px;
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--binance-gray-500);
}

/* Preview Area */
.preview-area {
    padding: 24px;
}

.preview-area.hidden {
    display: none;
}

.preview-wrapper {
    position: relative;
    display: inline-block;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
}

.preview-wrapper img {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-card);
}

.remove-btn {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 36px;
    height: 36px;
    background: #E03C3C;
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(224, 60, 60, 0.4);
}

.remove-btn:hover {
    transform: scale(1.1);
    background: #c92a2a;
}

.remove-btn svg {
    width: 18px;
    height: 18px;
}

.preview-info {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 16px;
    font-size: 0.875rem;
    color: var(--binance-gray-400);
}

.file-name {
    color: var(--binance-gray-300);
}

/* API Settings */
.api-settings {
    background: var(--gradient-card);
    border: 1px solid var(--binance-gray-700);
    border-radius: var(--border-radius);
    padding: 24px;
    backdrop-filter: blur(10px);
}

.settings-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    font-weight: 600;
    color: var(--binance-gray-300);
}

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

.input-group label {
    font-size: 0.875rem;
    color: var(--binance-gray-400);
}

.input-group input {
    background: var(--binance-gray-900);
    border: 1px solid var(--binance-gray-700);
    border-radius: var(--border-radius-sm);
    padding: 14px 16px;
    font-size: 1rem;
    color: var(--binance-white);
    font-family: var(--font-main);
    transition: var(--transition);
}

.input-group input:focus {
    outline: none;
    border-color: var(--binance-yellow);
    box-shadow: 0 0 0 3px rgba(240, 185, 11, 0.1);
}

.input-group input::placeholder {
    color: var(--binance-gray-500);
}

.api-link {
    font-size: 0.875rem;
    color: var(--binance-yellow);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Transform Button */
.transform-btn {
    background: var(--gradient-gold);
    border: none;
    border-radius: var(--border-radius);
    padding: 18px 48px;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--binance-black);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    transition: var(--transition);
    box-shadow: var(--shadow-gold);
    font-family: var(--font-main);
    width: 100%;
}

.transform-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 40px rgba(240, 185, 11, 0.4);
}

.transform-btn:active:not(:disabled) {
    transform: translateY(0);
}

.transform-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-icon {
    font-size: 1.25rem;
}

.btn-loading {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-loading.hidden {
    display: none;
}

.transform-btn.loading .btn-icon,
.transform-btn.loading .btn-text {
    display: none;
}

.transform-btn.loading .btn-loading {
    display: flex;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: var(--binance-black);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Result Section */
.result-section {
    margin-top: 60px;
    animation: fadeInUp 0.6s ease-out;
}

.result-section.hidden {
    display: none;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 32px;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.result-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.result-card {
    background: var(--gradient-card);
    border: 1px solid var(--binance-gray-700);
    border-radius: var(--border-radius);
    padding: 16px;
    position: relative;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.result-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.result-card.transformed {
    border-color: var(--binance-yellow);
}

.card-label {
    position: absolute;
    top: -12px;
    left: 16px;
    background: var(--binance-gray-800);
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 0.75rem;
    color: var(--binance-gray-300);
    border: 1px solid var(--binance-gray-700);
}

.result-card.transformed .card-label {
    background: var(--binance-yellow);
    color: var(--binance-black);
    border-color: var(--binance-yellow);
    font-weight: 600;
}

.result-card img {
    max-width: 300px;
    max-height: 300px;
    border-radius: var(--border-radius-sm);
    display: block;
}

.binance-badge {
    position: absolute;
    bottom: 24px;
    right: 24px;
    background: rgba(0, 0, 0, 0.7);
    padding: 8px;
    border-radius: var(--border-radius-sm);
    backdrop-filter: blur(10px);
}

.binance-badge img {
    width: 24px;
    height: 24px;
}

.arrow-icon {
    color: var(--binance-yellow);
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

.result-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 32px;
    flex-wrap: wrap;
}

.download-btn,
.retry-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-main);
}

.download-btn {
    background: var(--gradient-gold);
    border: none;
    color: var(--binance-black);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-gold);
}

.retry-btn {
    background: transparent;
    border: 2px solid var(--binance-gray-600);
    color: var(--binance-gray-300);
}

.retry-btn:hover {
    border-color: var(--binance-yellow);
    color: var(--binance-yellow);
}

.download-btn svg,
.retry-btn svg {
    width: 20px;
    height: 20px;
}

/* Features Section */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-top: 80px;
}

.feature-card {
    background: var(--gradient-card);
    border: 1px solid var(--binance-gray-700);
    border-radius: var(--border-radius);
    padding: 32px;
    text-align: center;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--binance-gray-600);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
    color: var(--binance-white);
}

.feature-card p {
    color: var(--binance-gray-400);
    font-size: 0.875rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 32px;
    color: var(--binance-gray-500);
    font-size: 0.875rem;
    border-top: 1px solid var(--binance-gray-800);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.footer-twitter {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--binance-gray-400);
    text-decoration: none;
    transition: var(--transition);
}

.footer-twitter:hover {
    color: var(--binance-yellow);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--binance-gray-800);
    border: 1px solid var(--binance-gray-700);
    padding: 16px 24px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: var(--shadow-card);
    transition: var(--transition);
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast.hidden {
    display: none;
}

.toast.error {
    border-color: #E03C3C;
}

.toast.success {
    border-color: #02C076;
}

.toast-icon {
    font-size: 1.25rem;
}

.toast-message {
    color: var(--binance-gray-200);
}

/* Hidden utility */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: 16px 24px;
        flex-direction: column;
        gap: 16px;
    }
    
    .header-right {
        flex-direction: column;
        gap: 12px;
    }
    
    .twitter-btn span {
        display: none;
    }
    
    .twitter-btn {
        padding: 10px;
        border-radius: 50%;
    }
    
    .hero {
        padding: 24px 0 40px;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .upload-area {
        padding: 40px 24px;
    }
    
    .result-container {
        flex-direction: column;
    }
    
    .arrow-icon {
        transform: rotate(90deg);
    }
    
    .result-card img {
        max-width: 100%;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--binance-gray-900);
}

::-webkit-scrollbar-thumb {
    background: var(--binance-gray-700);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--binance-gray-600);
}