/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Slightly lighter, premium Navy Blue palette as requested */
    --color-bg-base: #0f172a;          /* Lighter midnight navy (slate-900) */
    --color-bg-surface: #1e293b;       /* Lighter navy card background (slate-800) */
    --color-bg-elevated: #334155;      /* Lighter elevated background (slate-700) */
    
    --color-border-subtle: #2e3b5e;    /* Slate-blue border */
    --color-border-focus: #60a5fa;     /* Bright blue focus */
    
    /* Text */
    --color-text-primary: #f8fafc;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    
    /* Buttons in lighter, higher visibility shades of blue */
    --color-primary: #60a5fa;          /* Sky/Light Blue button */
    --color-primary-hover: #3b82f6;
    
    /* Grades status */
    --color-passing-bg: #10b981;       /* Emerald Green */
    --color-failing-bg: #ef4444;       /* Rose Red */
    --color-warning-bg: #f59e0b;       /* Amber Yellow for exactly 4.0 */
    
    --color-avg-passing-bg: rgba(16, 185, 129, 0.15);
    --color-avg-passing-text: #10b981;
    
    --color-avg-failing-bg: rgba(239, 68, 68, 0.15);
    --color-avg-failing-text: #ef4444;
    
    --color-avg-warning-bg: rgba(245, 158, 11, 0.15);
    --color-avg-warning-text: #f59e0b;
    
    --color-avg-neutral-bg: rgba(148, 163, 184, 0.15);
    --color-avg-neutral-text: #94a3b8;

    /* Fonts & Radii */
    --font-family-sans: 'Outfit', sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    background-color: var(--color-bg-base);
    color: var(--color-text-primary);
    font-family: var(--font-family-sans);
    line-height: 1.5;
    padding: 2rem 1.5rem;
    padding: calc(2rem + env(safe-area-inset-top)) calc(1.5rem + env(safe-area-inset-right)) calc(2rem + env(safe-area-inset-bottom)) calc(1.5rem + env(safe-area-inset-left));
    min-height: 100vh;
    min-height: 100dvh;
}

/* Confetti Canvas */
#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 9999;
}

/* App Container */
.app-container {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Main Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 0.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-circle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--color-primary);
    color: var(--color-bg-base);
    border-radius: 50%;
}

.header-text h1 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: white;
}

.header-subtitle {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-family-sans);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-bg-base);
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: #27354a;
    color: #a5b4fc;
    border: 1px solid var(--color-border-subtle);
}

.btn-secondary:hover {
    background-color: var(--color-bg-elevated);
    color: white;
}

/* Promotion Dashboard (Green Card) */
.promo-dashboard-container {
    background-color: #3b5a45;         /* Cozy forest green card */
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    color: white;
}

.promo-header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.promo-status-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background-color: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
}

.promo-text-summary h2 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.promo-text-summary p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 0.15rem;
}

/* Stats Cards Grid */
.promo-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

@media (max-width: 640px) {
    .promo-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.promo-stat-card {
    background-color: rgba(10, 15, 30, 0.7); /* Dark semi-translucent inner panels */
    border-radius: var(--radius-md);
    padding: 1rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.promo-stat-value {
    font-size: 1.5rem;
    font-weight: 800;
    color: white;
    line-height: 1.2;
}

.promo-stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    margin-top: 0.25rem;
}

.promo-stat-sublabel {
    font-size: 0.65rem;
    color: var(--color-text-secondary);
    margin-top: 0.1rem;
}

.promo-footer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 0.75rem;
}

/* Subjects Section & List */
.subjects-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.subjects-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

/* Subject Card */
.subject-card {
    background-color: var(--color-bg-surface);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.subject-card:hover {
    border-color: rgba(255, 255, 255, 0.08);
}

.subject-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.subject-title-area {
    display: flex;
    flex-direction: column;
}

.subject-name {
    font-size: 1.25rem;
    font-weight: 800;
    color: white;
}

.subject-target {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-top: 0.15rem;
    cursor: pointer;
    border-bottom: 1px dashed rgba(255,255,255,0.2);
    width: fit-content;
}

.subject-target:hover {
    color: white;
}

/* Circular Average Badge - Expanded for prominence */
.subject-average-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    text-align: center;
    flex-shrink: 0;
}

.subject-average-badge.passing {
    background-color: rgba(16, 185, 129, 0.15);
    border: 2px solid rgba(16, 185, 129, 0.3);
}

.subject-average-badge.warning {
    background-color: rgba(245, 158, 11, 0.15);
    border: 2px solid rgba(245, 158, 11, 0.3);
}

.subject-average-badge.failing {
    background-color: rgba(239, 68, 68, 0.15);
    border: 2px solid rgba(239, 68, 68, 0.3);
}

.subject-average-badge.empty {
    background-color: rgba(148, 163, 184, 0.15);
    border: 2px solid rgba(148, 163, 184, 0.3);
}

.subject-average-val {
    font-size: 1.4rem;
    font-weight: 800;
    line-height: 1.1;
}

.subject-average-badge.passing .subject-average-val { color: #10b981; }
.subject-average-badge.warning .subject-average-val { color: #f59e0b; }
.subject-average-badge.failing .subject-average-val { color: #ef4444; }
.subject-average-badge.empty .subject-average-val { color: #94a3b8; }

.subject-average-lbl {
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.05em;
}

.subject-average-badge.passing .subject-average-lbl { color: rgba(16, 185, 129, 0.7); }
.subject-average-badge.warning .subject-average-lbl { color: rgba(245, 158, 11, 0.7); }
.subject-average-badge.failing .subject-average-lbl { color: rgba(239, 68, 68, 0.7); }
.subject-average-badge.empty .subject-average-lbl { color: rgba(148, 163, 184, 0.7); }

.btn-delete-subject {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: 1.25rem;
    transition: color var(--transition-fast);
    padding: 12px;
    line-height: 1;
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-delete-subject:hover {
    color: var(--color-failing-bg);
}

.bilan-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

/* TA & TS Grading Lanes layout */
.grade-lanes-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    border-top: 1px solid var(--color-border-subtle);
    border-bottom: 1px solid var(--color-border-subtle);
    padding: 0.85rem 0;
}

@media (max-width: 480px) {
    .grade-lanes-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

.grade-lane {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    min-height: 40px;
}

.lane-title {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--color-border-subtle);
    padding-bottom: 0.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.lane-avg-badge {
    font-size: 0.7rem;
    font-weight: 800;
    background-color: var(--color-bg-base);
    padding: 1px 6px;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
}

.lane-avg-badge.passing { color: #10b981; }
.lane-avg-badge.warning { color: #f59e0b; }
.lane-avg-badge.failing { color: #ef4444; }

.lane-grades-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

/* Grade pill */
.grade-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.35rem 0.65rem;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 0.85rem;
    font-weight: 800;
    cursor: pointer;
    transition: transform var(--transition-fast), filter var(--transition-fast);
}

.grade-pill:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}

.grade-pill.passing {
    background-color: #15803d; /* Deep green */
}

.grade-pill.warning {
    background-color: #d97706; /* Yellow/Amber for 4.0 */
}

.grade-pill.failing {
    background-color: #b91c1c; /* Deep red */
}

/* Subject Footer */
.subject-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.subject-status {
    font-size: 0.85rem;
    font-weight: 600;
    color: #10b981;
}

.subject-status.warning {
    color: #f59e0b;
}

.subject-status.not-reached {
    color: #ef4444;
}

.subject-status.neutral {
    color: var(--color-text-secondary);
}

/* Modals & Popups */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(5, 7, 12, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-backdrop.active {
    opacity: 1;
    pointer-events: all;
}

.modal-container {
    background-color: var(--color-bg-surface);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 440px;
    padding: 2rem;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-backdrop.active .modal-container {
    transform: translateY(0);
}

.modal-close-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    padding: 12px;
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.modal-close-btn:hover {
    color: white;
}

.modal-title {
    font-size: 1.35rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.form-group {
    margin-bottom: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.form-input {
    width: 100%;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-sm);
    color: white;
    padding: 0.75rem 1rem;
    font-family: var(--font-family-sans);
    font-size: 16px;              /* Prevent iOS auto-zoom on input focus */
    outline: none;
    transition: all var(--transition-fast);
    -webkit-appearance: none;
    appearance: none;
}

.form-input:focus {
    border-color: var(--color-border-focus);
    background-color: var(--color-bg-surface);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1.75rem;
}

/* Animations */
.slide-up {
    animation: slideUp 0.3s ease-out forwards;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.paper-texture {
    background-image: 
      radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.05) 0px, transparent 50%),
      radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.03) 0px, transparent 50%);
}

/* Interactive Grade/Type Chips */
.chip-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.25rem;
    width: 100%;
}

.chip-btn {
    flex: 1;
    min-width: 54px;
    background-color: var(--color-bg-base);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-subtle);
    padding: 0.65rem 0.25rem;
    font-size: 0.85rem;
    font-weight: 800;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-align: center;
    transition: all var(--transition-fast);
}

.chip-btn:hover {
    background-color: var(--color-bg-elevated);
    color: white;
}

.chip-btn.active {
    background-color: var(--color-primary);
    color: var(--color-bg-base);
    border-color: var(--color-primary);
    box-shadow: 0 0 10px rgba(96, 165, 250, 0.3);
}

/* Grade Chips Grid */
#grade-chips {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.4rem;
}

#grade-chips .chip-btn {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Langue 2 Switcher Styling */
.lang-toggle-container {
    display: inline-flex;
    background-color: var(--color-bg-base);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-full);
    padding: 2px;
    margin-top: 0.25rem;
    width: fit-content;
}

.lang-toggle-btn {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: 0.65rem;
    font-weight: 800;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
}

.lang-toggle-btn.active {
    background-color: var(--color-primary);
    color: var(--color-bg-base);
}

/* Semester Selection Tabs */
.semester-tabs-container {
    display: flex;
    gap: 0.4rem;
    margin-bottom: 0.25rem;
    background-color: var(--color-bg-surface);
    border: 1px solid var(--color-border-subtle);
    padding: 4px;
    border-radius: var(--radius-md);
    width: 100%;
}

.semester-tab {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-family: var(--font-family-sans);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.65rem 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.semester-tab:hover {
    color: white;
    background-color: var(--color-bg-elevated);
}

.semester-tab.active {
    background-color: var(--color-primary);
    color: var(--color-bg-base);
}

/* Annual Comparison Layout */
.annual-comparison-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    border-top: 1px solid var(--color-border-subtle);
    border-bottom: 1px solid var(--color-border-subtle);
    padding: 0.75rem 0;
    text-align: center;
}

.comparison-col {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.comparison-col-title {
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.comparison-col-val {
    font-size: 1.15rem;
    font-weight: 800;
    color: white;
    line-height: 1.3;
}

.comparison-col-val.passing { color: #10b981; }
.comparison-col-val.warning { color: #f59e0b; }
.comparison-col-val.failing { color: #ef4444; }
.comparison-col-val.empty { color: var(--color-text-muted); }

/* App Footer */
.app-footer {
    text-align: center;
    padding-top: 1.5rem;
    margin-top: 1rem;
    border-top: 1px solid var(--color-border-subtle);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    opacity: 0.8;
}

/* Mobile Responsive Adjustments (< 600px) */
@media (max-width: 599px) {
    body {
        padding: 1rem;
        padding: calc(1rem + env(safe-area-inset-top)) calc(1rem + env(safe-area-inset-right)) calc(1rem + env(safe-area-inset-bottom)) calc(1rem + env(safe-area-inset-left));
    }
    
    .app-container {
        gap: 1rem;
    }
    
    .header {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 1rem;
    }
    
    .header-left {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }
    
    .header-text {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .header-text > div {
        justify-content: center;
    }
    
    .header-actions {
        justify-content: center;
        width: 100%;
    }
    
    .bilan-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .modal-container {
        width: calc(100% - 2rem);
        padding: 1.5rem;
    }
    
    .form-actions {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .form-actions .btn {
        width: 100%;
    }
}