/* ========================================
   ACHIEVEMENTS – Grid, cards, tiers,
   locked state, flip, metallic shine
   ======================================== */

/* Achievements Grid */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, 140px);
    gap: 0.75rem;
    justify-content: center;
    margin-top: 0.5rem;
}

.achievement-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 1rem 0.75rem;
    border-radius: 10px;
    border: 1px solid var(--pico-muted-border-color);
    background-color: rgba(255, 255, 255, 0.03);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
    height: 10rem;
}

.achievement-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.achievement-emoji {
    font-size: 1.75rem;
    margin-bottom: 0.4rem;
}

.achievement-name {
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--pico-color);
    margin-bottom: 0.25rem;
    line-height: 1.2;
}

.achievement-tier {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* Tier-specific colors */
.tier-bronze  { border-color: #cd7f32; }
.tier-bronze .achievement-tier { color: #cd7f32; }
.tier-bronze:hover { box-shadow: 0 4px 12px rgba(205, 127, 50, 0.15); }

.tier-silber  { border-color: #c0c0c0; }
.tier-silber .achievement-tier { color: #c0c0c0; }
.tier-silber:hover { box-shadow: 0 4px 12px rgba(192, 192, 192, 0.15); }

.tier-gold    { border-color: var(--accent-gold); }
.tier-gold .achievement-tier { color: var(--accent-gold); }
.tier-gold:hover { box-shadow: 0 4px 12px rgba(240, 180, 41, 0.15); }

.tier-diamant { border-color: #b9f2ff; box-shadow: 0 0 12px rgba(185, 242, 255, 0.15); }
.tier-diamant .achievement-tier { color: #b9f2ff; }
.tier-diamant:hover { box-shadow: 0 0 16px rgba(185, 242, 255, 0.25); }

/* Locked achievement card */
.achievement-locked {
    border-color: var(--pico-muted-border-color);
    opacity: 0.5;
}
.achievement-locked:hover {
    opacity: 0.65;
    transform: translateY(-2px);
}

/* Emoji silhouette for locked */
.achievement-emoji-locked {
    filter: brightness(0);
    opacity: 0.3;
}

/* Unlock condition hint */
.achievement-hint {
    font-size: 0.65rem;
    color: var(--pico-muted-color);
    margin-top: 0.25rem;
    font-style: italic;
    line-height: 1.2;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ========================================
   ACHIEVEMENT FLIP + METALLIC SHINE
   ======================================== */

/* Flip container */
.achievement-card:not(.achievement-locked) {
    perspective: 600px;
    position: relative;
    background: none;
    border: none;
    box-shadow: none;
    padding: 0;
}

.achievement-front,
.achievement-back {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transition: transform 0.5s ease;
    border-radius: 10px;
    border: 1px solid var(--pico-muted-border-color);
    background-color: rgba(255, 255, 255, 0.03);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.achievement-front {
    padding: 1rem 0.75rem;
    position: relative;
    overflow: hidden;
    width: 100%;
    height: 100%;
    justify-content: center;
}

.achievement-back {
    position: absolute;
    inset: 0;
    transform: rotateY(180deg);
    padding: 0.75rem;
    justify-content: center;
    background-color: rgba(20, 23, 34, 0.97);
}

.achievement-desc {
    font-size: 0.7rem;
    color: var(--pico-muted-color);
    line-height: 1.3;
    margin-top: 0.3rem;
}

/* Hover flip */
.achievement-card:not(.achievement-locked):hover .achievement-front {
    transform: rotateY(-180deg);
}

.achievement-card:not(.achievement-locked):hover .achievement-back {
    transform: rotateY(0);
}

/* Override old hover translateY for non-locked flippable cards */
.achievement-card:not(.achievement-locked):hover {
    transform: none;
    box-shadow: none;
}

/* Touch flip via .flipped class */
.achievement-card.flipped .achievement-front {
    transform: rotateY(-180deg);
}

.achievement-card.flipped .achievement-back {
    transform: rotateY(0);
}

/* Tier-specific borders on front/back */
.tier-bronze .achievement-front,
.tier-bronze .achievement-back { border-color: #cd7f32; }
.tier-silber .achievement-front,
.tier-silber .achievement-back { border-color: #c0c0c0; }
.tier-gold .achievement-front,
.tier-gold .achievement-back { border-color: var(--accent-gold); }
.tier-diamant .achievement-front,
.tier-diamant .achievement-back {
    border-color: #b9f2ff;
    box-shadow: 0 0 12px rgba(185, 242, 255, 0.15);
}

/* Tier hover shadows on front */
.tier-bronze:not(.achievement-locked):hover .achievement-front { box-shadow: 0 4px 12px rgba(205, 127, 50, 0.15); }
.tier-silber:not(.achievement-locked):hover .achievement-front { box-shadow: 0 4px 12px rgba(192, 192, 192, 0.15); }
.tier-gold:not(.achievement-locked):hover .achievement-front { box-shadow: 0 4px 12px rgba(240, 180, 41, 0.15); }
.tier-diamant:not(.achievement-locked):hover .achievement-front { box-shadow: 0 0 16px rgba(185, 242, 255, 0.25); }

/* Metallic shine on achievement-front */
.achievement-front::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    pointer-events: none;
    animation: achievement-shine 5s ease-in-out infinite;
    opacity: 0;
}

@keyframes achievement-shine {
    0%, 75% { transform: translateX(-100%) rotate(25deg); opacity: 0; }
    80% { opacity: 1; }
    95% { transform: translateX(100%) rotate(25deg); opacity: 0; }
    100% { opacity: 0; }
}

/* Tier-specific shine colors */
.tier-bronze .achievement-front::after {
    background: linear-gradient(
        120deg,
        transparent 30%,
        rgba(205, 127, 50, 0.2) 45%,
        rgba(205, 127, 50, 0.4) 50%,
        rgba(205, 127, 50, 0.2) 55%,
        transparent 70%
    );
}

.tier-silber .achievement-front::after {
    background: linear-gradient(
        120deg,
        transparent 30%,
        rgba(192, 192, 192, 0.2) 45%,
        rgba(192, 192, 192, 0.4) 50%,
        rgba(192, 192, 192, 0.2) 55%,
        transparent 70%
    );
}

.tier-gold .achievement-front::after {
    background: linear-gradient(
        120deg,
        transparent 30%,
        rgba(240, 180, 41, 0.2) 45%,
        rgba(240, 180, 41, 0.4) 50%,
        rgba(240, 180, 41, 0.2) 55%,
        transparent 70%
    );
}

.tier-diamant .achievement-front::after {
    background: linear-gradient(
        120deg,
        transparent 30%,
        rgba(185, 242, 255, 0.2) 45%,
        rgba(185, 242, 255, 0.4) 50%,
        rgba(185, 242, 255, 0.2) 55%,
        transparent 70%
    );
}

/* Stagger shine delays */
.achievements-grid .achievement-card:nth-child(4n+2) .achievement-front::after { animation-delay: 1.25s; }
.achievements-grid .achievement-card:nth-child(4n+3) .achievement-front::after { animation-delay: 2.5s; }
.achievements-grid .achievement-card:nth-child(4n+4) .achievement-front::after { animation-delay: 3.75s; }

/* ========================================
   ACHIEVEMENTS – Light Theme
   ======================================== */

[data-theme="light"] .achievement-card {
    background-color: rgba(0, 0, 0, 0.02);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .tier-diamant {
    border-color: #0ea5e9;
    box-shadow: 0 0 12px rgba(14, 165, 233, 0.1);
}
[data-theme="light"] .tier-diamant .achievement-tier { color: #0ea5e9; }
[data-theme="light"] .tier-diamant:hover { box-shadow: 0 0 16px rgba(14, 165, 233, 0.2); }

[data-theme="light"] .achievement-locked { opacity: 0.45; }
[data-theme="light"] .achievement-emoji-locked { opacity: 0.2; }

/* Light theme overrides for flip */
[data-theme="light"] .achievement-front,
[data-theme="light"] .achievement-back {
    background-color: rgba(0, 0, 0, 0.02);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .achievement-back {
    background-color: rgba(245, 245, 245, 0.97);
}

/* ========================================
   ACHIEVEMENTS – Responsive
   ======================================== */

@media (max-width: 768px) {
    .achievements-grid {
        grid-template-columns: repeat(auto-fill, 140px);
    }
}