/* ========================
   Global Styles
   ======================== */

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

:root {
    --primary-color: #003d7a;
    --secondary-color: #d4af37;
    --success-color: #27ae60;
    --error-color: #e74c3c;
    --warning-color: #f39c12;
    --light-bg: #f8f9fa;
    --border-color: #dee2e6;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

/* ========================
   Container & Layout
   ======================== */

.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1000px;
    margin: 0 auto;
    background: white;
}

.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #0a5ba6 100%);
    color: white;
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.header-content h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.header-content .subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
    font-weight: 300;
}

.main-content {
    flex: 1;
    padding: 3rem 2rem;
}

/* ========================
   About Section
   ======================== */

.about-section {
    background: linear-gradient(135deg, rgba(0, 61, 122, 0.05) 0%, rgba(212, 175, 55, 0.05) 100%);
    padding: 2rem;
    margin: 2rem;
    border-radius: 12px;
    border-left: 5px solid var(--primary-color);
    box-shadow: var(--shadow);
}

.about-section h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.6rem;
}

.about-content p {
    color: var(--text-dark);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.about-content h3 {
    color: var(--primary-color);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.programs-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0 1.5rem 0;
}

.programs-list li {
    background: white;
    padding: 1rem;
    margin: 0.5rem 0;
    border-radius: 8px;
    border-left: 3px solid var(--secondary-color);
    color: var(--text-dark);
    line-height: 1.6;
}

.programs-list li strong {
    color: var(--primary-color);
}

.footer {
    background: #f0f0f0;
    color: var(--text-light);
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.footer p {
    margin: 0.5rem 0;
}

.security-note {
    color: var(--success-color);
    font-weight: 500;
}

/* ========================
   Sections
   ======================== */

.verification-section,
.results-section {
    background: #ffffff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.verification-section h2,
.results-section h2 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.8rem;
}

.instruction {
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 1rem;
}

/* ========================
   Form Styles
   ======================== */

.verification-form {
    display: grid;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.form-group input[type="text"],
.form-group input[type="file"] {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 61, 122, 0.1);
}

.form-group small {
    color: var(--text-light);
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

/* ========================
   QR Upload Area
   ======================== */

.qr-upload-area {
    border: 2px dashed var(--primary-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    background: rgba(0, 61, 122, 0.02);
    cursor: pointer;
    transition: all 0.3s ease;
}

.qr-upload-area:hover {
    border-color: var(--secondary-color);
    background: rgba(212, 175, 55, 0.05);
}

.qr-upload-area input[type="file"] {
    display: none;
}

.qr-upload-area p {
    color: var(--text-light);
    margin: 0;
    pointer-events: none;
}

/* ========================
   Buttons
   ======================== */

.btn-verify,
.btn-verify-another {
    background: linear-gradient(135deg, var(--primary-color) 0%, #0a5ba6 100%);
    color: white;
    padding: 0.875rem 2rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 61, 122, 0.2);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-verify:hover,
.btn-verify-another:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 61, 122, 0.3);
}

.btn-verify:active,
.btn-verify-another:active {
    transform: translateY(0);
}

.btn-verify-another {
    display: block;
    margin: 2rem auto 0;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
}

/* ========================
   Loading Spinner
   ======================== */

.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 2rem;
}

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

.spinner {
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-spinner p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* ========================
   Results Display
   ======================== */

.results-section {
    display: none;
}

.results-section:not(.hidden) {
    display: block;
}

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

.result-card {
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.result-card.valid {
    background: linear-gradient(135deg, rgba(39, 174, 96, 0.1) 0%, rgba(39, 174, 96, 0.05) 100%);
    border-left: 5px solid var(--success-color);
}

.result-card.invalid {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.1) 0%, rgba(231, 76, 60, 0.05) 100%);
    border-left: 5px solid var(--error-color);
}

.result-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.result-icon {
    font-size: 2.5rem;
    font-weight: bold;
}

.result-card.valid .result-icon {
    color: var(--success-color);
}

.result-card.invalid .result-icon {
    color: var(--error-color);
}

.result-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.result-card.valid .result-title {
    color: var(--success-color);
}

.result-card.invalid .result-title {
    color: var(--error-color);
}

.result-message {
    color: var(--text-light);
    margin: 0;
    font-size: 0.95rem;
}

/* Receipt Details */
.receipt-details {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1.5rem;
    border: 1px solid var(--border-color);
}

.receipt-details h3 {
    color: var(--primary-color);
    font-size: 1.1rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

.receipt-detail-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.detail-item {
    padding: 0.75rem;
    background: var(--light-bg);
    border-radius: 6px;
}

.detail-label {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-value {
    color: var(--text-light);
    font-size: 1rem;
    margin-top: 0.25rem;
    word-break: break-word;
}

/* Validation Details */
.validation-check {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    margin: 0.5rem 0;
    border-radius: 6px;
    font-size: 0.95rem;
}

.validation-check.matched {
    background: rgba(39, 174, 96, 0.1);
    color: var(--success-color);
}

.validation-check.mismatched {
    background: rgba(231, 76, 60, 0.1);
    color: var(--error-color);
}

.validation-icon {
    font-weight: bold;
    font-size: 1.2rem;
}

/* ========================
   Error Messages
   ======================== */

.error-message {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.1) 0%, rgba(231, 76, 60, 0.05) 100%);
    border-left: 4px solid var(--error-color);
    color: var(--error-color);
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.error-message.hidden {
    display: none;
}

/* ========================
   Utility Classes
   ======================== */

.hidden {
    display: none !important;
}

/* ========================
   Responsive Design
   ======================== */

@media (max-width: 768px) {
    .header-content h1 {
        font-size: 1.8rem;
    }

    .header-content .subtitle {
        font-size: 1rem;
    }

    .main-content {
        padding: 1.5rem 1rem;
    }

    .verification-section,
    .results-section {
        padding: 1.5rem 1rem;
    }

    .receipt-detail-row {
        grid-template-columns: 1fr;
    }

    .form-group input[type="text"] {
        padding: 0.6rem;
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .qr-upload-area {
        padding: 1.5rem 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        border-radius: 0;
    }

    .header {
        padding: 2rem 1rem;
    }

    .header-content h1 {
        font-size: 1.5rem;
    }

    .verification-section h2,
    .results-section h2 {
        font-size: 1.3rem;
    }

    .btn-verify,
    .btn-verify-another {
        width: 100%;
    }

    .result-header {
        flex-direction: column;
        gap: 0.5rem;
    }

    .detail-item {
        grid-column: 1 / -1;
    }
}