:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --error-color: #ef4444;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --radius: 1rem;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
}

.container {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    width: 100%;
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
}

.theme-toggle,
.logout-link {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 1.25rem;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: background 0.2s;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover,
.logout-link:hover {
    background: var(--border-color);
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
    width: 100%;
}

h1 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

h2 {
    font-size: 1.25rem;
    font-weight: 700;
}

p.subtitle {
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    width: 100%;
    font-size: 1rem;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    width: auto;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

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

.btn-google {
    background-color: #ffffff;
    color: #374151;
    border: 1px solid var(--border-color);
    display: flex;
    gap: 0.75rem;
}

.btn-google:hover {
    background-color: #f9fafb;
}

.mood-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.mood-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s;
}

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

.mood-item.selected {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: white;
}

.mood-emoji {
    font-size: 1.5rem;
}

.mood-label {
    font-size: 0.875rem;
    font-weight: 500;
}

textarea {
    width: 100%;
    padding: 1rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-color);
    resize: none;
    margin-bottom: 1.5rem;
    min-height: 100px;
}

.stats-card {
    text-align: center;
}

.stats-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-color);
    margin: 1rem 0;
}

.stats-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.stat-row {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-label {
    width: 100px;
    font-size: 0.875rem;
}

.stat-bar-bg {
    flex: 1;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.stat-bar {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 4px;
    transition: width 0.6s ease-out;
}

.stat-count {
    width: 30px;
    font-size: 0.875rem;
    text-align: right;
    color: var(--text-muted);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-radius: 0.75rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
}

.hidden {
    display: none;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

/* Mood Calendar */
.mood-calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.calendar-day {
    aspect-ratio: 1;
    border-radius: 4px;
    background-color: var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    position: relative;
    cursor: default;
}

.calendar-day[data-mood="yorgun"] {
    background-color: #94a3b8;
}

.calendar-day[data-mood="yalniz"] {
    background-color: #64748b;
}

.calendar-day[data-mood="umutlu"] {
    background-color: #fcd34d;
}

.calendar-day[data-mood="kaygili"] {
    background-color: #f87171;
}

.calendar-day[data-mood="mutlu"] {
    background-color: #4ade80;
}

.calendar-day[data-mood="boslukta"] {
    background-color: #e2e8f0;
}

.calendar-day[data-mood="huzurlu"] {
    background-color: #60a5fa;
}

.calendar-day[data-mood="uzgun"] {
    background-color: #818cf8;
}

.calendar-day[data-mood="heyecanli"] {
    background-color: #fb923c;
}

.calendar-day:hover::after {
    content: attr(title);
    position: absolute;
    bottom: 120%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-color);
    color: var(--bg-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    white-space: nowrap;
    z-index: 10;
    font-size: 0.7rem;
}

/* Global Stats Teaser */
.global-stats-teaser {
    margin-top: 1.5rem;
    padding: 1rem;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 0.75rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--primary-color);
    font-weight: 600;
}

/* IOS Installation Prompt */
.ios-prompt {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 400px;
    z-index: 9999;
    animation: slideUp 0.5s ease-out;
}

.ios-prompt-content {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
    text-align: center;
    position: relative;
    color: var(--text-color);
}

.ios-prompt-arrow {
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 0; 
    height: 0; 
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 10px solid var(--card-bg); /* Matches card bg */
}

/* For dark mode arrow border */
[data-theme="dark"] .ios-prompt-arrow {
    border-top-color: var(--border-color);
}
[data-theme="dark"] .ios-prompt-arrow::after {
    content: '';
    position: absolute;
    top: -12px;
    left: -10px;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 10px solid var(--card-bg);
}


.share-icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236366f1' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 12v8a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-8'%3E%3C/path%3E%3Cpolyline points='16 6 12 2 8 6'%3E%3C/polyline%3E%3Cline x1='12' y1='2' x2='12' y2='15'%3E%3C/line%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    vertical-align: middle;
    margin: 0 4px;
}

#closeIosPrompt {
    margin-top: 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
}

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