/* --- THEME: DEFAULT (HEAVYREP) --- */
.theme-default {
    --bg-main: #333333; /* Darker Grey */
    --text-main: #F5F5F5; /* Light Grey / White */
    --cta-primary: #DF5A01; /* Brand Orange */
    --btn-secondary: #DF5A01; /* Brand Orange */
    --btn-danger: #c53030;
    --card-bg: #4a4a4a; /* Medium Grey */
    --border-color: #616161; /* Lighter Grey for borders */
    --completed-bg: #5a5a5a; /* Slightly different grey for completed */
    --progress-bar-bg: #616161;
    --text-secondary: #b1b1b1;
}

/* --- THEME: OCEAN --- */
.theme-ocean {
    --bg-main: #0B2545;
    --text-main: #EEF4ED;
    --cta-primary: #DF5A01; /* Brand Orange */
    --btn-secondary: #134074;
    --btn-danger: #e53e3e;
    --card-bg: #13315C;
    --border-color: #3E5F8A;
    --completed-bg: #1E4D8A;
    --progress-bar-bg: #3E5F8A;
    --text-secondary: #a2b4c5;
}

/* --- THEME: FOREST --- */
.theme-forest {
    --bg-main: #2d3a3a;
    --text-main: #f0ece2;
    --cta-primary: #DF5A01; /* Brand Orange */
    --btn-secondary: #c57b57;
    --btn-danger: #e57373;
    --card-bg: #435757;
    --border-color: #637C7B;
    --completed-bg: #5A7474;
    --progress-bar-bg: #637C7B;
    --text-secondary: #b9c2bf;
}


/* --- General & Body --- */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s;
}

main#app-container {
    max-width: 700px;
    margin: 0 auto;
    padding: 20px;
}

.hidden { display: none !important; }

/* --- Login View --- */
#login-view {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
}
.login-container {
    width: 100%;
    max-width: 400px;
    padding: 30px;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    text-align: center;
}
.login-container .logo-container { justify-content: center; margin-bottom: 20px; }
.login-container .form-input { margin-bottom: 15px; }
.login-container .btn { width: 100%; margin-top: 10px; }

/* --- Persistent App Header --- */
.app-header {
    background-color: var(--card-bg);
    padding: 10px 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
}

.logo-container { display: flex; align-items: center; }
.logo { height: 40px; width: 40px; margin-right: 12px; }
.brand-name { font-size: 1.5rem; font-weight: 700; color: var(--text-main); }

.header-actions { display: flex; align-items: center; gap: 15px; }
#header-username { color: var(--cta-primary); font-weight: 700; }
.icon-btn { background: none; border: none; color: var(--text-main); font-size: 1.5rem; cursor: pointer; }

/* --- Tabs --- */
.tabs { display: flex; background-color: var(--card-bg); box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
.tab-link { flex-grow: 1; padding: 15px; background: none; border: none; border-bottom: 3px solid transparent; color: var(--text-main); font-size: 1.1rem; font-weight: 600; cursor: pointer; transition: all 0.2s ease; }
.tab-link:hover { background-color: rgba(255,255,255,0.1); }
.tab-link.active { border-bottom-color: var(--cta-primary); color: var(--cta-primary); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* --- Main Header --- */
.main-header { display: flex; justify-content: space-between; align-items: flex-start; margin-top: 24px; margin-bottom: 24px; }
.main-header h1 { font-size: 2rem; font-weight: 700; color: var(--text-main); margin: 0 0 4px 0; }
#current-date { color: var(--text-secondary); font-size: 1rem; }
.header-stats { text-align: right; display: flex; gap: 20px;}
.stat-item { text-align: center; }
.stat-title { font-size: 1.1rem; font-weight: 500; margin: 0; }
.stat-number { font-size: 2.5rem; font-weight: 700; color: var(--btn-secondary); margin: 0; }

/* --- Cards & Sections --- */
.progress-card, .exercise-card, .weight-tracker-card, .stats-card, .chart-container { background-color: var(--card-bg); border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.2); padding: 16px; margin-bottom: 16px; }
.section-title { font-size: 1.5rem; font-weight: 600; margin-top: 32px; margin-bottom: 16px; padding-left: 5px; border-left: 3px solid var(--cta-primary); }
.exercise-list { display: flex; flex-direction: column; gap: 12px; }

/* --- Circular Progress Bar --- */
.progress-circle-container {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 20px auto;
}
.progress-circle-container svg {
    transform: rotate(-135deg); /* Start at bottom-left */
}
.progress-circle-bg, .progress-circle-bar {
    fill: none;
    stroke-width: 20;
    stroke-linecap: round;
}
.progress-circle-bg {
    stroke: var(--progress-bar-bg);
}
.progress-circle-bar {
    stroke: var(--btn-secondary);
    transition: stroke-dashoffset 0.5s ease-in-out;
}
.progress-circle-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
}
.progress-card h2 { text-align: center; }


/* --- Exercise Card --- */
.exercise-card { display: flex; align-items: center; justify-content: space-between; transition: all 0.3s ease; border-left: 5px solid transparent; }
.exercise-card.completed { background-color: var(--completed-bg); border-left: 5px solid var(--btn-secondary); }
.exercise-card.dragging { opacity: 0.5; }
.exercise-info { display: flex; align-items: center; flex-grow: 1; }
.grab-handle { cursor: grab; color: var(--border-color); margin-right: 15px; font-size: 1.5rem; touch-action: none; /* Prevents scrolling on touch */ }
.no-select { -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; } /* Prevents text selection */
.exercise-info .toggle-complete-btn { font-size: 1.75rem; margin-right: 16px; border: none; background: none; cursor: pointer; color: var(--border-color); }
.exercise-card.completed .toggle-complete-btn { color: var(--btn-secondary); }
.exercise-details .name { font-weight: 600; font-size: 1.1rem; }
.exercise-details .stats { font-size: 0.9rem; color: var(--text-secondary); }
.exercise-details .notes { font-size: 0.8rem; color: #b0b0b0; font-style: italic; margin-top: 4px; }
.exercise-actions button { background: none; border: none; cursor: pointer; color: #a0a0a0; padding: 8px; font-size: 1rem; }
.exercise-actions button:hover { color: var(--text-main); }
.exercise-actions .delete-btn:hover { color: var(--cta-primary); }

/* --- Buttons --- */
.add-button-container { margin-top: 32px; display: flex; justify-content: center; }
.btn { padding: 12px 28px; border: none; border-radius: 8px; font-size: 1rem; font-weight: 700; cursor: pointer; transition: all 0.2s ease; box-shadow: 0 2px 4px rgba(0,0,0,0.2); text-transform: uppercase; letter-spacing: 0.5px; }
.btn:hover { transform: translateY(-2px); box-shadow: 0 4px 8px rgba(0,0,0,0.3); }
.btn-primary { background-color: var(--cta-primary); color: var(--text-main); }
.btn-primary .fa-plus { margin-right: 8px; }
.btn-secondary { background-color: var(--btn-secondary); color: var(--text-main); }
.btn-danger { background-color: var(--btn-danger); color: var(--text-main); }

/* --- Modals & Forms --- */
.modal-overlay { position: fixed; inset: 0; background-color: rgba(0, 0, 0, 0.6); display: flex; justify-content: center; align-items: center; backdrop-filter: blur(4px); z-index: 20; }
.modal-overlay.hidden { display: none; }
.modal-content { background: var(--card-bg); padding: 24px; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.3); width: 90%; max-width: 400px; border-top: 4px solid var(--cta-primary); }
.modal-content h3, .modal-content h4 { margin-top: 0; color: var(--text-main); }
.modal-content hr { border: 1px solid var(--border-color); margin: 20px 0; }
.modal-body { margin: 16px 0; }
.form-input, .form-textarea, .form-group select { width: 100%; padding: 10px; border: 1px solid var(--border-color); border-radius: 6px; font-size: 16px; /* Prevents iOS zoom */ box-sizing: border-box; background-color: var(--bg-main); color: var(--text-main); }
.form-input::placeholder, .form-textarea::placeholder { color: #a0a0a0; }
.form-textarea { min-height: 80px; resize: vertical; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 500; }
.modal-footer { display: flex; gap: 10px; justify-content: flex-end; margin-top: 16px; }
#logout-section p { margin: 0 0 10px 0; }
#logout-section .btn { width: 100%; }

.login-prompt { font-size: 14px; color: var(--text-secondary); text-align: center; margin-bottom: 15px; line-height: 1.4; }
.login-prompt a { color: var(--btn-secondary); text-decoration: none; }
.login-prompt a:hover { text-decoration: underline; }

/* --- Toast Notification --- */
.toast { visibility: hidden; position: fixed; left: 50%; transform: translateX(-50%); bottom: 30px; background-color: var(--cta-primary); color: var(--bg-main); font-weight: 600; text-align: center; border-radius: 8px; padding: 16px; z-index: 100; font-size: 1rem; opacity: 0; transition: visibility 0s, opacity 0.5s, bottom 0.5s; box-shadow: 0 3px 8px rgba(0,0,0,0.3); }
.toast.show { visibility: visible; opacity: 1; bottom: 50px; }

/* --- Stats Page --- */
.stats-header { text-align: center; margin-bottom: 20px; }
#stats-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.stats-card h3 { margin-top: 0; border-bottom: 2px solid var(--border-color); padding-bottom: 8px; }
.stats-card ul { list-style: none; padding: 0; }
.stats-card li { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--border-color); }
.stats-card li:last-child { border-bottom: none; }
.stats-card .stat-value { font-weight: 700; color: var(--btn-secondary); }
.stats-card .note { font-size: 0.8rem; color: var(--text-secondary); margin-top: 10px; font-style: italic; }
.freeze-info { display: flex; align-items: center; gap: 5px; }
.freeze-info .fa-snowflake { color: #87CEEB; }

/* --- Chart Container --- */
.chart-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    background-color: var(--card-bg);
    padding: 15px;
    border-radius: 8px;
}
.chart-controls label {
    font-weight: 600;
}
.chart-controls select {
    width: auto;
    min-width: 200px;
}
.chart-container {
    position: relative;
    height: 300px;
    margin-top: 30px;
    padding: 10px;
}

/* --- Weight Tracker --- */
.weight-tracker-card h3 { margin-top: 0; text-align: center; }
.weight-controls { display: flex; justify-content: center; align-items: center; gap: 20px; margin-top: 10px; }
.weight-controls button { background-color: var(--btn-secondary); color: var(--text-main); border: none; width: 40px; height: 40px; font-size: 1.5rem; border-radius: 50%; cursor: pointer; }
#current-weight-display { font-size: 1.8rem; font-weight: 700; }

/* --- Footer --- */
footer { text-align: center; padding: 20px; margin-top: 40px; color: var(--text-secondary); font-size: 0.9rem; }
footer a { color: var(--btn-secondary); text-decoration: none; }
footer a:hover { text-decoration: underline; }