/* ==================== CSS Variables ==================== */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #ec4899;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.hidden {
    display: none !important;
}

/* ==================== Auth Page ==================== */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.auth-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: var(--primary-color);
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: var(--secondary-color);
    bottom: -50px;
    right: -50px;
    animation-delay: -5s;
}

.shape-3 {
    width: 200px;
    height: 200px;
    background: var(--accent-color);
    top: 50%;
    left: 50%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(30px, -30px) rotate(5deg); }
    50% { transform: translate(0, -50px) rotate(0deg); }
    75% { transform: translate(-30px, -30px) rotate(-5deg); }
}

.auth-box {
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 48px;
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 440px;
    position: relative;
    z-index: 1;
    animation: slideUp 0.5s ease;
}

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

.auth-logo {
    text-align: center;
    margin-bottom: 40px;
}

.logo-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 16px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.auth-logo h1 {
    font-size: 2.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

.auth-tabs {
    display: flex;
    margin-bottom: 32px;
    background: var(--surface-light);
    padding: 6px;
    border-radius: var(--radius-md);
}

.auth-tab {
    flex: 1;
    padding: 12px 16px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.auth-tab:hover {
    color: var(--text-primary);
}

.auth-tab.active {
    background: var(--surface);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.tab-icon {
    font-size: 1.1rem;
}

.auth-form {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.input-group {
    position: relative;
    margin-bottom: 20px;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    opacity: 0.6;
}

.input-group input {
    width: 100%;
    padding: 14px 16px 14px 48px;
    background: var(--surface);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input-group input::placeholder {
    color: var(--text-muted);
}

/* ==================== Buttons ==================== */
.btn-primary {
    width: 100%;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.btn-primary::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 var(--transition-slow);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary {
    padding: 12px 24px;
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.btn-float {
    padding: 16px 32px;
    font-size: 1.05rem;
}

.btn-icon-wrapper {
    width: 44px;
    height: 44px;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.btn-icon-wrapper:hover {
    background: var(--border-color);
    transform: scale(1.05);
}

.btn-icon {
    font-size: 1.2rem;
}

.btn-loader {
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.error-message {
    color: var(--danger-color);
    margin-top: 20px;
    padding: 12px 16px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

/* ==================== Header ==================== */
.header {
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-mini {
    font-size: 1.8rem;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.user-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    background: var(--surface-light);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.user-avatar {
    font-size: 1.3rem;
}

.user-name {
    font-weight: 500;
    color: var(--text-primary);
}

/* ==================== Main Content ==================== */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px;
}

.view-toggle {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    background: var(--surface);
    padding: 6px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    width: fit-content;
}

.view-btn {
    padding: 12px 24px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-normal);
}

.view-btn:hover {
    color: var(--text-primary);
}

.view-btn.active {
    background: var(--surface-light);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.view-icon {
    font-size: 1.1rem;
}

.action-bar {
    margin-bottom: 32px;
}

.view-container {
    animation: fadeIn 0.4s ease;
}

/* ==================== Calendar ==================== */
.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    background: var(--surface);
    padding: 20px 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.calendar-nav {
    width: 44px;
    height: 44px;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

.calendar-nav:hover {
    background: var(--border-color);
    transform: scale(1.05);
}

.calendar-title {
    font-size: 1.5rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
    margin-bottom: 12px;
}

.weekday {
    text-align: center;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-muted);
    padding: 12px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
}

.calendar-day {
    aspect-ratio: 1;
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 8px;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    position: relative;
    min-height: 80px;
}

.calendar-day:hover {
    border-color: var(--primary-color);
    transform: scale(1.02);
}

.calendar-day.other-month {
    opacity: 0.3;
}

.calendar-day.today {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.calendar-day.has-entry::after {
    content: '';
    position: absolute;
    bottom: 8px;
    width: 6px;
    height: 6px;
    background: var(--success-color);
    border-radius: 50%;
}

.day-number {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 4px;
}

.day-dots {
    display: flex;
    gap: 2px;
    flex-wrap: wrap;
    justify-content: center;
}

.day-dot {
    width: 6px;
    height: 6px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
}

/* ==================== Entries List ==================== */
.entries-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.entry-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.entry-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.entry-card:hover::before {
    transform: scaleX(1);
}

.entry-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.entry-title {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--text-primary);
}

.entry-date {
    color: var(--text-muted);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.entry-preview {
    color: var(--text-secondary);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.entry-images-preview {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.entry-images-preview img {
    width: 70px;
    height: 70px;
    object-fit: cover;
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
}

/* ==================== Modal ==================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 20px;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease;
}

.modal-content {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 720px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    z-index: 1;
    animation: slideUp 0.3s ease;
}

.modal-header {
    padding: 24px 28px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.4rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 12px;
}

.modal-icon {
    font-size: 1.5rem;
}

.close-btn {
    width: 40px;
    height: 40px;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--text-secondary);
    transition: all var(--transition-normal);
}

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

.entry-form {
    padding: 28px;
}

.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.input-title {
    width: 100%;
    padding: 14px 18px;
    background: var(--surface-light);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

.input-title:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input-title::placeholder {
    color: var(--text-muted);
}

.input-content {
    width: 100%;
    min-height: 280px;
    padding: 16px 18px;
    background: var(--surface-light);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
    resize: vertical;
    transition: all var(--transition-normal);
}

.input-content:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input-content::placeholder {
    color: var(--text-muted);
}

.image-upload-section {
    margin-top: 12px;
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    background: var(--surface-light);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.upload-label:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.upload-text {
    color: var(--text-secondary);
    font-weight: 500;
}

.image-preview {
    display: flex;
    gap: 12px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.preview-image {
    position: relative;
}

.preview-image img {
    width: 110px;
    height: 110px;
    object-fit: cover;
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
}

.preview-image .remove-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--danger-color);
    color: white;
    border: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.preview-image .remove-btn:hover {
    transform: scale(1.1);
}

.form-actions {
    display: flex;
    gap: 16px;
    margin-top: 32px;
}

.form-actions .btn-secondary,
.form-actions .btn-primary {
    flex: 1;
}

/* ==================== View Modal ==================== */
.view-content {
    max-width: 800px;
}

.view-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.title-text {
    font-size: 1.4rem;
}

.view-body {
    padding: 32px;
}

.view-date {
    color: var(--text-muted);
    margin-bottom: 24px;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.date-icon {
    font-size: 1.2rem;
}

.view-images {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.view-images img {
    max-width: 100%;
    max-height: 350px;
    border-radius: var(--radius-lg);
    object-fit: contain;
    border: 2px solid var(--border-color);
}

.view-content-text {
    line-height: 1.85;
    font-size: 1.05rem;
    color: var(--text-primary);
    white-space: pre-wrap;
}

/* ==================== Empty State ==================== */
.empty-state {
    text-align: center;
    padding: 80px 20px;
}

.empty-state h2 {
    font-size: 1.75rem;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.empty-state p {
    font-size: 1.05rem;
    color: var(--text-secondary);
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
    .auth-box {
        padding: 32px 24px;
    }

    .header-content {
        padding: 14px 16px;
    }

    .header h1 {
        font-size: 1.2rem;
    }

    .user-badge {
        display: none;
    }

    .main-content {
        padding: 20px 16px;
    }

    .calendar-grid {
        gap: 4px;
    }

    .calendar-day {
        min-height: 60px;
        padding: 6px;
    }

    .day-number {
        font-size: 0.9rem;
    }

    .entry-card {
        padding: 20px;
    }

    .modal-content {
        border-radius: var(--radius-lg);
    }

    .modal-header,
    .entry-form,
    .view-body {
        padding: 20px;
    }

    .view-toggle {
        width: 100%;
    }

    .view-btn {
        flex: 1;
    }
}

@media (max-width: 480px) {
    .calendar-weekdays {
        gap: 2px;
    }

    .weekday {
        font-size: 0.75rem;
        padding: 8px 4px;
    }

    .calendar-day {
        min-height: 50px;
    }
}