@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg: #fafafa;
    --surface: #ffffff;
    --text: #18181b;
    --text-muted: #71717a;
    --border: #e4e4e7;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(-45deg, #0a0a0f, #1a1a2e, #0f1419, #0c4a6e);
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
    color: #e0e0ff;
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow-x: hidden;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navbar - glassmorphism */
.navbar {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h1 {
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(45deg, #06b6d4, #0891b2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links a {
    color: rgba(224, 224, 255, 0.7);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.nav-links a:hover {
    color: #22d3ee;
}

/* Main content */
.main {
    flex: 1;
    display: flex;
    align-items: center;
    padding: 3rem 0;
}

/* Landing */
.landing {
    text-align: center;
    width: 100%;
}

.tagline {
    font-size: 2.5rem;
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 0.75rem;
    background: linear-gradient(45deg, #06b6d4, #0891b2, #22d3ee);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.tagline::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, #06b6d4, #0891b2);
    transition: width 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.tagline:hover::after {
    width: 100%;
}

.subtitle {
    font-size: 1.125rem;
    color: rgba(224, 224, 255, 0.7);
    margin-bottom: 3rem;
}

/* Choice cards */
.choice-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    max-width: 600px;
    margin: 0 auto;
}

.choice-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 1rem;
    padding: 2.5rem 1.5rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    text-align: center;
    font-family: inherit;
    position: relative;
    overflow: hidden;
    min-height: 360px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.choice-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.choice-card:hover::before {
    left: 100%;
}

.choice-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(6, 182, 212, 0.3);
    border-color: rgba(6, 182, 212, 0.5);
}

.choice-card:active {
    transform: translateY(-4px);
}

.choice-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    animation: float 3s ease-in-out infinite;
}

.choice-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #e0e0ff;
}

.choice-card p {
    font-size: 0.875rem;
    color: rgba(224, 224, 255, 0.7);
    line-height: 1.5;
}

.choice-card .card-tagline {
    font-size: 0.8125rem;
    color: #22d3ee;
    font-weight: 600;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 1rem;
}

.feature-badge {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    background: rgba(6, 182, 212, 0.2);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: 0.5rem;
    font-size: 0.75rem;
    color: #22d3ee;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.choice-card:hover .feature-badge {
    background: rgba(6, 182, 212, 0.3);
    border-color: rgba(6, 182, 212, 0.5);
    transform: translateY(-2px);
}

/* Flow sections */
.flow-section {
    width: 100%;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.flow-section h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.flow-desc {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.back-btn {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(224, 224, 255, 0.7);
    font-size: 0.875rem;
    cursor: pointer;
    margin-bottom: 1.5rem;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-family: inherit;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.back-btn:hover {
    color: #22d3ee;
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

/* Input area */
.input-area {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.75rem;
    padding: 1.5rem;
}

.input-area textarea {
    width: 100%;
    min-height: 120px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.5rem;
    padding: 1rem;
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    margin-bottom: 1rem;
    color: #e0e0ff;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.input-area textarea::placeholder {
    color: rgba(224, 224, 255, 0.4);
}

.input-area textarea:focus {
    outline: none;
    border-color: #06b6d4;
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
    transform: translateY(-2px);
}

.file-upload-area {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.file-upload-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: #e0e0ff;
    cursor: pointer;
    transition: all 0.2s ease;
}

.file-upload-label:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.file-upload-icon {
    font-size: 1.2rem;
}

.file-name {
    color: #60a5fa;
    font-size: 0.875rem;
    display: none;
}

.form-row input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.5rem;
    font-family: inherit;
    font-size: 1rem;
    color: #e0e0ff;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.form-row input::placeholder {
    color: rgba(224, 224, 255, 0.4);
}

.form-row input:focus {
    outline: none;
    border-color: #06b6d4;
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
    transform: translateY(-2px);
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, #06b6d4, #0891b2);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    font-family: inherit;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-primary:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(6, 182, 212, 0.5);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(6, 182, 212, 0.3);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-large {
    width: 100%;
    padding: 1rem;
}

/* Results */
.result-area {
    margin-top: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.75rem;
    padding: 1.5rem;
    animation: slide-in 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.result-status {
    font-weight: 600;
    font-size: 1rem;
}

.result-status.verified {
    color: var(--success);
}

.result-status.pending {
    color: var(--warning);
}

.result-status.failed {
    color: var(--error);
}

.result-confidence {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.result-details {
    color: var(--text-muted);
    font-size: 0.9375rem;
    line-height: 1.6;
}

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

/* Visually hidden - accessible to screen readers but not visible */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Footer */
.footer {
    padding: 1.5rem 0;
    text-align: center;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer p {
    color: rgba(224, 224, 255, 0.6);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 600px) {
    .tagline {
        font-size: 2rem;
    }

    .choice-cards {
        grid-template-columns: 1fr;
    }

    .main {
        padding: 2rem 0;
    }
}

/* Keyframe Animations */
@keyframes gradient-shift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

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

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px rgba(6, 182, 212, 0.3); }
    50% { box-shadow: 0 0 40px rgba(6, 182, 212, 0.6); }
}

@keyframes slide-in {
    from { transform: translateX(-100px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

@keyframes success-bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes crypto-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(6, 182, 212, 0); }
}

@keyframes float-particle {
    0% { transform: translateY(0px) translateX(0px); }
    33% { transform: translateY(-20px) translateX(10px); }
    66% { transform: translateY(-10px) translateX(-10px); }
    100% { transform: translateY(0px) translateX(0px); }
}

@keyframes dot-pulse {
    0%, 80%, 100% { opacity: 0.3; }
    40% { opacity: 1; }
}

/* Particles */
.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(6, 182, 212, 0.6);
    border-radius: 50%;
    animation: float-particle 3s ease-in-out infinite;
}

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

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #06b6d4, #0891b2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #22d3ee, #06b6d4);
}