:root,
html[data-theme='light'] {
    --color-primary: #1ea0aa;
    --color-primary-light: #25d5c9;
    --color-dark: #153f53;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-bg: #f1f5f9;
    --color-bg-secondary: #e2e8f0;
    --color-bg-card: #ffffff;
    --color-border: rgba(21, 63, 83, 0.15);
    
    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(21, 63, 83, 0.2);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);

    --gradient-bg: 
        radial-gradient(at 0% 0%, rgba(37, 213, 201, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(21, 63, 83, 0.1) 0px, transparent 50%),
        #f1f5f9;
}

html[data-theme='dark'] {
    --color-primary: #1f8e88;
    --color-primary-light: #4dbfb9;
    
    --color-dark: #153f53;
    --color-text: #e5e7eb;
    --color-text-muted: rgba(255, 255, 255, 0.55);
    
    --color-bg: #0a0e1f;
    --color-bg-secondary: #1a1e3f;
    --color-bg-card: rgba(255, 255, 255, 0.03);
    --color-border: rgba(255, 255, 255, 0.1);

    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.15);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.37);

    --gradient-bg: linear-gradient(to bottom, #0f172a 0%, #020617 100%);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--gradient-bg);
    background-attachment: fixed;
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    transition: background 0.5s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
}

/* === CONTAINER === */
.captcha-container {
    max-width: 550px;
    width: 100%;
    background: #ffffff;
    border: 1px solid rgba(226, 232, 240, 1);
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.02), 
        0 10px 15px -3px rgba(0, 0, 0, 0.05);
    border-radius: 24px;
    
    padding: 3rem;
    animation: slideUp 0.6s ease;
    position: relative;
    overflow: hidden;
}

html[data-theme='dark'] .captcha-container {
    background: linear-gradient(160deg, rgba(20, 30, 50, 0.6) 0%, rgba(20, 30, 50, 0.4) 100%);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
}

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

.captcha-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    color: var(--color-primary);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
    text-decoration: none;
}

html[data-theme='light'] .back-link {
    background: #f8fafc;
}

.back-link:hover {
    transform: translateX(-5px);
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(30, 160, 170, 0.15);
}

.captcha-header h1 {
    font-size: 2.25rem;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
}

.captcha-header p {
    color: var(--color-text-muted);
    font-size: 1.05rem;
}

.captcha-form {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.captcha-image-wrapper {
    position: relative;
    background: #f1f5f9;
    padding: 1rem;
    border-radius: 14px;
    border: 2px dashed var(--color-border);
    max-width: 360px;
    margin: 0 auto;
}

html[data-theme='dark'] .captcha-image-wrapper {
    background: rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.15);
}

.captcha-image {
    width: 100%;
    max-width: 320px;
    height: 70px;
    margin: 0 auto;
    display: block;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    object-fit: contain;
    image-rendering: auto; 
}

.refresh-btn {
    width: auto;
    min-width: 180px;
    margin: 0.75rem auto 0;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 0.7rem 1.2rem;
    font-size: 0.9rem;
    color: var(--color-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

html[data-theme='dark'] .refresh-btn {
    color: var(--color-primary-light);
    border-color: rgba(255, 255, 255, 0.2);
}

.refresh-btn:hover {
    background: rgba(30, 160, 170, 0.1);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.refresh-btn:active {
    transform: translateY(0);
}

.warning-message,
.error-message,
.cooldown-message {
    padding: 1.25rem;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 500;
    backdrop-filter: blur(12px);
    text-align: center;
}

.warning-message, .cooldown-message {
    background: rgba(255, 193, 7, 0.1);
    border: 1px solid rgba(255, 193, 7, 0.3);
    color: #ffc107;
}

html[data-theme='light'] .warning-message, 
html[data-theme='light'] .cooldown-message {
    background: #fffbeb;
    border-color: #fcd34d;
    color: #b45309;
}

.error-message {
    background: rgba(244, 67, 54, 0.1);
    border: 1px solid rgba(244, 67, 54, 0.3);
    color: #f44336;
}

html[data-theme='light'] .error-message {
    background: #fef2f2;
    border-color: #fecaca;
    color: #b91c1c;
}

html[data-theme='dark'] .error-message {
    background: rgba(60, 20, 20, 0.4);
    color: #fca5a5;
    border-color: rgba(239, 68, 68, 0.3);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.input-group label {
    font-size: 1rem;
    color: var(--color-text);
    font-weight: 600;
}

.captcha-input {
    padding: 1.25rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    background: #f8fafc;
    color: var(--color-text);
    font-size: 1.25rem;
    font-family: 'SF Mono', 'Monaco', 'Cascadia Code', monospace;
    text-align: center;
    letter-spacing: 0.5rem;
    transition: all 0.3s ease;
}

html[data-theme='dark'] .captcha-input {
    background: rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--color-primary-light);
}

.captcha-input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: #ffffff;
    box-shadow: 0 0 0 4px rgba(30, 160, 170, 0.1);
}

html[data-theme='dark'] .captcha-input:focus {
    background: rgba(0, 0, 0, 0.5);
}

.captcha-input::placeholder {
    color: var(--color-text-muted);
    opacity: 0.6;
}

.submit-btn {
    padding: 1.25rem;
    border-radius: 12px;
    border: none;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: #ffffff;
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(30, 160, 170, 0.4);
}


.submit-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(30, 160, 170, 0.6);
}

.submit-btn:active {
    transform: translateY(-2px);
}

/* Footer */
.captcha-footer {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.captcha-footer a {
    color: var(--color-primary);
    text-decoration: underline;
    transition: color 0.3s;
}

.captcha-footer a:hover {
    color: var(--color-primary-light);
}

.refresh-message {
    margin-top: 1rem;
    padding: 1rem 1.25rem;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
    backdrop-filter: blur(12px);
    animation: slideDown 0.3s ease;
}

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

@media (max-width: 600px) {
    .captcha-container {
        padding: 2rem 1.5rem;
    }
    .captcha-header h1 { font-size: 1.75rem; }
    .captcha-image-wrapper { padding: 0.75rem; max-width: 280px; }
    .captcha-image { max-width: 260px; height: 60px; }
    .captcha-input { font-size: 1.1rem; letter-spacing: 0.3rem; }
}