@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;700;900&display=swap');

/* ==============================
   1. CSS VARIABLES & THEMES
============================== */
:root {
    --radius: 24px;
    --touch-target: 65px; 
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    --safe-top: env(safe-area-inset-top, 20px); 
}

/* --- TEMA 1: ALB COMPLET (Default) --- */
.theme-white {
    --bg-body: #ffffff;
    --bg-image: none;
    --primary-blue: #2563eb;
    --primary-dark: #1e40af;
    --surface: #ffffff;
    --text-main: #0f172a;
    --text-secondary: #64748b;
    --board-border: #334155;
    --cell-bg: #ffffff;
    --cell-text: #000000;
    --selected-bg: #60a5fa;   
    --highlight-bg: #a5d8ff;  
    --match-bg: #fff59d;      
    --error-bg: #ffcdd2;
    --card-opacity: 1;
    --btn-gradient-start: #003D73;
    --btn-gradient-end: #3b82f6;
    --btn-text: #ffffff;
    --back-btn-bg: #f8fafc;
    --back-btn-border: #e2e8f0;
    --color-cell: #2563eb;
}

/* --- TEMA 2: VERDE (Natură) --- */
.theme-green {
    --bg-body: #f0fdf4;
    --bg-image: none;
    --primary-blue: #15803d;
    --primary-dark: #14532d;
    --surface: #ffffff;
    --text-main: #064e3b;
    --text-secondary: #166534;
    --board-border: #14532d;
    --cell-bg: #f0fdf4;
    --cell-text: #064e3b;
    --selected-bg: #34d399; 
    --highlight-bg: #bbf7d0; 
    --match-bg: #86efac; 
   --error-bg: #fecaca;
    --card-opacity: 1;
    --btn-gradient-start: #166534;
    --btn-gradient-end: #4ade80;
    --btn-text: #ffffff;
    --back-btn-bg: #ffffff;
    --back-btn-border: #86efac;
    --color-cell: #16a34a;
    
}


/* --- TEMA 3: PEISAJ ZI (Golden Hour - Transparent) --- */
.theme-day {
    --bg-body: #fff7db;
    --bg-image: url('https://images.unsplash.com/photo-1470252649378-9c29740c9fa8?q=80&w=1000&auto=format&fit=crop');
    --primary-blue: #d97706;
    --primary-dark: #92400e;  
    --surface: rgba(255, 255, 255, 0.75);
    --text-main: #3a1d00;
    --text-secondary: #92400e;
    --board-border: #b45309;
    --cell-bg: rgba(255, 255, 255, 0.75);
    --cell-text: #3a1d00;  
    --selected-bg: rgba(245, 158, 11, 0.95);
    --highlight-bg: rgba(253, 230, 138, 0.95);  
    --match-bg: rgba(251, 191, 36, 0.75);  
    --error-bg: rgba(248, 113, 113, 0.9);
    --card-opacity: 0.96;
    --btn-gradient-start: rgba(217, 119, 6, 0.95);
    --btn-gradient-end: rgba(250, 204, 21, 0.95);
    --btn-text: #ffffff;
    --back-btn-bg: rgba(255, 255, 255, 0.8);
    --back-btn-border: #b45309;
    --color-cell: #92400e;
}



/* --- TEMA 4: CER NOAPTE (Dark Mode - Transparent) --- */
.theme-night {
    --bg-body: #0f172a;
    --bg-image: url('https://images.unsplash.com/photo-1532978379173-523e16f371f2?q=80&w=1000&auto=format&fit=crop');

    --primary-blue: #60a5fa;
    --primary-dark: #3b82f6;

 
    --surface: rgba(15, 23, 42, 0.6); 
    --text-main: #f8fafc;
    --text-secondary: #cbd5e1;
    --board-border: #f8fafc; 

    --cell-bg: rgba(30, 41, 59, 0.4);  
    --cell-text: #ffffff;

    --selected-bg: rgba(59, 130, 246, 0.8);
    --highlight-bg: rgba(123, 185, 236, 0.6);
    --match-bg: rgba(59, 130, 246, 0.6);
    --error-bg: rgba(220, 38, 38, 0.8);

    --card-opacity: 0.9;
    --btn-gradient-start: rgba(30, 58, 138, 0.6);
    --btn-gradient-end: rgba(59, 130, 246, 0.6);
    --btn-text: #ffffff;
    --back-btn-bg: rgba(30, 41, 59, 0.5);
    --back-btn-border: #94a3b8;

   
    --btn-count-text: #cbd5e1;
    --color-cell: #3b82f6;
}

/* ==============================
   BODY RESET
============================== */
* {
    box-sizing: border-box;
    font-family: 'Inter', 'Roboto', sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    margin: 0;
    min-height: 100dvh; 
    background-color: var(--bg-body);
    background-image: var(--bg-image);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-main);
    transition: background 0.5s ease;
    padding-top: var(--safe-top); 
}

/* ==============================
   THEME SELECTOR
============================== */
.theme-selector {
    display: flex;
    gap: 12px;
    margin-bottom: 25px;
    background: rgba(0,0,0,0.08);
    padding: 10px;
    border-radius: 50px;
    backdrop-filter: blur(4px);
}
.theme-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.2);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.theme-btn:hover { transform: scale(1.15); box-shadow: 0 4px 8px rgba(0,0,0,0.2); }
.t-white { background: #ffffff; }
.t-green { background: #22c55e; }
.t-day   { background: #fbbf24; }
.t-night { background: #0f172a; border-color: #94a3b8; }

/* ==============================
   HOME CONTAINER / CARD
============================== */
.home-container {
    width: 90%;
    max-width: 400px;
    padding: 40px 24px;
    background: var(--surface);
    border-radius: 32px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.15);
   
    animation: fadeIn 0.3s ease-out forwards; 
    will-change: transform, opacity;
}


@keyframes fadeIn { 
    from { opacity: 0.1; transform: translateY(10px); } 
    to { opacity: 1; transform: translateY(0); } 
}


.theme-white .home-container::before, .theme-white .home-container::after,
.theme-green .home-container::before, .theme-green .home-container::after {
    content: ''; position: absolute; border-radius: 50%;
    opacity: 0.06; z-index: -1; animation: floatOrbits 15s linear infinite;
}
.home-container::before { width: 220px; height: 220px; background: var(--primary-dark); top: -80px; left: -80px; }
.home-container::after { width: 140px; height: 140px; background: var(--primary-blue); bottom: -60px; right: -60px; }
@keyframes floatOrbits { 
    0% { transform: rotate(0deg) translate(0,0); }
    50% { transform: rotate(180deg) translate(15px,-15px); }
    100% { transform: rotate(360deg) translate(0,0); }
}

/* ==============================
   TITLU
============================== */
.app-title {
    font-size: 4.5rem;
    font-weight: 900;
    margin-top: 45px; /* NOU: Împinge textul mai jos pentru a nu se suprapune */
    margin-bottom: 25px;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.1));
    line-height: 1.2;
}

.theme-night .app-title {
    -webkit-text-fill-color: var(--primary-blue);
    background: none;
    text-shadow: 0 0 15px rgba(96, 165, 250, 0.4);
}

/* ==============================
   BUTOANE PRINCIPALE & BACK
============================== */
.home-btn {
    width: 100%;
    height: var(--touch-target); 
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--btn-gradient-start) 0%, var(--btn-gradient-end) 100%);
    color: var(--btn-text);
    border-radius: 18px;
    border: none;
    font-size: 1.25rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transition: all 0.2s ease;
    backdrop-filter: blur(4px);
}

.home-btn:hover { transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,0,0,0.25); }
.home-btn:active { transform: scale(0.96); }

/* Buton secundar */
.home-btn.secondary {
    background: var(--back-btn-bg);
    color: var(--primary-dark);
    border: 2px solid var(--board-border);
}
.theme-night .home-btn.secondary { color: var(--primary-blue); border-color: var(--primary-blue); }

/* Buton BACK (Global) */
.back-btn {
    background: var(--back-btn-bg);
    border: 1px solid var(--back-btn-border);
    color: var(--primary-blue);
    height: 44px;
    padding: 0 20px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    font-weight: 700;
    font-size: 1rem;
    transition: all 0.2s;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    position: absolute; 
    top: 20px;
    left: 20px;
    z-index: 10;
    backdrop-filter: blur(5px);
}
.back-btn:hover { background: var(--primary-blue); color: #fff; border-color: transparent; }

/* Titlu pagină generic (Select Difficulty) */
#titlu-pagina {
    margin-top: 50px;
    text-align: center;
    color: var(--primary-blue);
    font-size: 2rem;
    margin-bottom: 30px;
}

/* ==============================
   RESPONSIVE
============================== */
@media (max-width: 400px) {
    .home-container { width: 95%; padding: 30px 15px; }
    .app-title { font-size: 3.5rem; margin-top: 40px; } /* NOU: Spațiu ajustat pentru telefoane mici */
    .home-btn { font-size: 1.1rem; height: 55px; }
}


/* ==============================
   LANGUAGE SELECTOR
============================== */
.lang-selector {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    background: rgba(255, 255, 255, 0.2);
    padding: 6px;
    border-radius: 16px;
    backdrop-filter: blur(4px);
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: 700;
    padding: 6px 12px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.lang-btn:hover {
    background: rgba(255,255,255,0.3);
    color: var(--text-main);
}

.lang-btn.active-lang {
    background: var(--primary-blue);
    color: #ffffff;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}


.action-btn {
    
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px; 
}

/* ==============================
   SETTINGS BUTTON (Interior Container)
============================== */

.top-actions {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 12px;
    z-index: 10;
}

.settings-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: transparent;
    border: 1px solid rgba(128, 128, 128, 0.2);
    color: var(--primary-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    transition: transform 0.2s, background 0.2s, box-shadow 0.2s;
}

.settings-btn svg {
    width: 26px; 
    height: 26px;
}

.settings-btn:hover {
    transform: rotate(90deg) scale(1.05);
    background: rgba(128, 128, 128, 0.1);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.theme-night .settings-btn {
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--text-main);
}

.exit-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: transparent;
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
    font-size: 22px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    z-index: 10;
    transition: transform 0.2s, background 0.2s, box-shadow 0.2s;
}

.exit-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    transform: scale(1.05);
}

.theme-night .exit-btn {
    border-color: rgba(239, 68, 68, 0.5);
}

/* ==============================
   SETTINGS MODAL
============================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
    display: flex !important;
}

.modal-content {
    background: var(--surface);
    width: 90%;
    max-width: 350px;
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transform: translateY(20px) scale(0.95);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
    transform: translateY(0) scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    border-bottom: 1px solid rgba(128, 128, 128, 0.2);
    padding-bottom: 12px;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--text-main);
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    transition: background 0.2s;
}

.close-btn:hover {
    background: rgba(128, 128, 128, 0.1);
    color: var(--text-main);
}

.settings-section {
    margin-bottom: 20px;
}

.settings-section h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin: 0 0 12px 0;
    letter-spacing: 1px;
}

.modal-content .lang-selector,
.modal-content .theme-selector {
    margin-bottom: 0;
    justify-content: center;
}

.exit-modal-content {
    text-align: center;
    border: 2px solid rgba(239, 68, 68, 0.2); 
}


.exit-modal-content .home-btn {
    font-size: 1rem;
    padding: 0 10px;
}


.exit-modal-content {
    animation: modalPop 0.3s cubic-bezier(0.17, 0.89, 0.32, 1.49);
}

@keyframes modalPop {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}