/* ===============================================
   DENTAL FEEDBACK WEBSITE - MAIN STYLES
   Medical-clean UI with soft blue accents
   =============================================== */

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

:root {
    /* Color Palette - Medical Clean */
    --primary-blue: #2563EB;
    --primary-blue-light: #3B82F6;
    --primary-blue-dark: #1E40AF;
    --soft-blue: #EFF6FF;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --white: #FFFFFF;
    --background: #F9FAFB;
    --border: #E5E7EB;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* ===============================================
   ENTRY SCREEN STYLES
   =============================================== */
.entry-screen .container {
    padding: var(--spacing-md);
}

.entry-content {
    text-align: center;
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.trust-badges {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--soft-blue);
    color: var(--primary-blue);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
}

.headline {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.subtext {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.value-props {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.prop {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: left;
    transition: all var(--transition-base);
}

.prop:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.prop .icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

/* CTA Button */
.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: clamp(0.85rem, 3vw, 1rem) clamp(1.5rem, 5vw, 2.5rem);
    font-size: clamp(1rem, 3vw, 1.125rem);
    font-weight: 600;
    color: var(--white);
    background: var(--primary-blue);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    min-width: 180px;
    width: 100%;
    max-width: 400px;
}

.cta-button:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.cta-button:active {
    transform: translateY(0);
}

.cta-button.locked {
    background: var(--text-muted);
    cursor: not-allowed;
}

.cta-button.locked:hover {
    background: var(--text-muted);
    transform: none;
}

.cta-button .arrow {
    font-size: 1.5rem;
    transition: transform var(--transition-base);
}

.cta-button:hover .arrow {
    transform: translateX(4px);
}

.lock-icon-btn {
    font-size: 1rem;
}

/* Privacy Notice */
.privacy-notice {
    margin-top: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.lock-icon {
    color: var(--success);
}

/* Trust Logos */
.trust-logos {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border);
}

.trust-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.logo-placeholder {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.logo-box {
    width: 80px;
    height: 40px;
    background: var(--soft-blue);
    border-radius: var(--radius-sm);
    border: 1px dashed var(--border);
}

/* ===============================================
   PROGRESS BAR
   =============================================== */
.progress-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md) 0;
    width: 100%;
}

.progress-step {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--border);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    transition: all var(--transition-base);
}

.progress-step.active {
    background: var(--primary-blue);
    color: var(--white);
    box-shadow: 0 0 0 4px var(--soft-blue);
}

.progress-step.completed {
    background: var(--success);
    color: var(--white);
}

.progress-line {
    width: 80px;
    height: 2px;
    background: var(--border);
    transition: background var(--transition-base);
}

.progress-line.completed {
    background: var(--success);
}

/* ===============================================
   VIDEO SCREEN STYLES
   =============================================== */
.video-content {
    width: 100%;
    max-width: 900px;
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.page-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.video-wrapper {
    margin-bottom: var(--spacing-xl);
}

.video-container {
    position: relative;
    width: 100%;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: #000;
    box-shadow: var(--shadow-xl);
}

.video-container video {
    width: 100%;
    height: auto;
    display: block;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: opacity var(--transition-base);
}

.video-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.overlay-content {
    text-align: center;
    color: var(--white);
}

.play-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: var(--spacing-sm);
}

/* Watch Progress */
.watch-progress {
    margin-top: var(--spacing-md);
}

.watch-bar {
    width: 100%;
    height: 8px;
    background: var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.watch-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-blue-light));
    border-radius: var(--radius-lg);
    transition: width var(--transition-base);
    width: 0%;
}

.watch-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
}

.requirement-text {
    color: var(--warning);
    font-weight: 500;
}

.button-container {
    text-align: center;
}

/* Tooltip */
.tooltip {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--text-primary);
    color: var(--white);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    box-shadow: var(--shadow-xl);
    animation: tooltipSlideUp 0.3s ease;
    z-index: 1000;
}

.tooltip.hidden {
    display: none;
}

@keyframes tooltipSlideUp {
    from {
        opacity: 0;
        transform: translate(-50%, 20px);
    }
    to {
        opacity: 1;
        transform: translate(-50%, 0);
    }
}

/* ===============================================
   SURVEY SCREEN STYLES
   =============================================== */
.survey-container {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
}

.question-progress {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    padding: 0 1rem;
}

.question-progress #currentQuestion {
    color: var(--primary-blue);
    font-weight: 600;
    font-size: 1.125rem;
}

.question-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: clamp(1.5rem, 5vw, 3rem);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    width: 100%;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.question-title {
    font-size: clamp(1.25rem, 4vw, 1.5rem);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: clamp(1.5rem, 4vw, 3rem);
    line-height: 1.4;
}

.question-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option-btn {
    padding: calc(var(--spacing-md) + 0.25rem);
    background: var(--white);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: left;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.option-btn:hover {
    border-color: var(--primary-blue);
    background: var(--soft-blue);
}

.option-btn.selected {
    border-color: var(--primary-blue);
    background: var(--soft-blue);
    color: var(--primary-blue);
}

.option-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px rgba(59,130,246,0.12);
    border-color: var(--primary-blue);
}

.option-btn.checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.option-btn.checkbox {
    display: flex;
    align-items: center;
}

.option-btn.checkbox::before {
    content: '';
    width: 1.4rem;
    height: 1.4rem;
    flex-shrink: 0;
    margin-right: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 0.375rem;
    background-color: transparent;
    background-position: center;
    background-repeat: no-repeat;
    transition: all var(--transition-base);
}

.option-btn.checkbox.selected::before {
    border-color: var(--primary-blue);
    background-color: rgba(59,130,246,0.08); /* subtle blue fill */
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232563EB' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><path d='M20 6L9 17l-5-5'/></svg>");
    background-size: 14px 14px;
}

/* Text Input */
.text-input,
.textarea-input {
    width: 100%;
    padding: clamp(0.75rem, 3vw, 1.5rem);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: clamp(0.95rem, 2.5vw, 1rem);
    font-family: var(--font-family);
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.text-input:focus,
.textarea-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px var(--soft-blue);
}

.textarea-input {
    min-height: 120px;
    resize: vertical;
}

/* Navigation Buttons */
.nav-buttons {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: clamp(1.5rem, 4vw, 3rem);
    width: 100%;
}

.btn-secondary {
    padding: clamp(0.75rem, 3vw, 0.875rem) clamp(1.25rem, 4vw, 1.5rem);
    font-size: clamp(0.95rem, 2.5vw, 1rem);
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--white);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 400px;
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
    background: var(--background);
}

/* ===============================================
   THANK YOU SCREEN STYLES
   =============================================== */
.thank-you-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.success-animation {
    margin-bottom: var(--spacing-xl);
    animation: scaleIn 0.5s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.checkmark {
    width: 80px;
    height: 80px;
    margin: 0 auto;
    background: var(--success);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: bold;
    box-shadow: 0 0 0 8px rgba(16, 185, 129, 0.1);
}

.thank-you-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.thank-you-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.next-steps {
    background: var(--soft-blue);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.incentive-box {
    background: linear-gradient(135deg, var(--soft-blue) 0%, #DBEAFE 100%);
    border: 2px solid var(--primary-blue-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.incentive-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.incentive-box h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.social-proof {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border);
}

.proof-text {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.action-buttons {
    margin-top: var(--spacing-xl);
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

/* ===============================================
   RESPONSIVE DESIGN
   =============================================== */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
        justify-content: flex-start;
        padding-top: 2rem;
    }

    .headline {
        font-size: 2rem;
    }

    .subtext {
        font-size: 1rem;
    }

    .progress-bar {
        margin-bottom: 1.5rem;
        padding: 0.5rem 0;
    }

    .progress-step {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }

    .progress-line {
        width: 40px;
    }

    .question-card {
        padding: 1.5rem;
    }

    .question-progress {
        margin-bottom: 1rem;
    }

    .nav-buttons {
        flex-direction: column-reverse;
        gap: 0.75rem;
    }
}

/* Extra small screens */
@media (max-width: 375px) {
    .container {
        padding: 0.75rem;
    }

    .question-card {
        padding: 1.25rem;
    }

    .progress-step {
        width: 32px;
        height: 32px;
        font-size: 0.85rem;
    }

    .progress-line {
        width: 30px;
    }
}

/* ===============================================
   LOADING STATE
   =============================================== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--soft-blue);
    border-top-color: var(--primary-blue);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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